I've seen a few leftist Catholics refer to the Holy Spirit as "She." 

Acceptable? Sinful? Blasphemous?

If either of the latter two, citation?

Blasphemous and sinful!

THIS ^^^

I've seen a few leftist Catholics refer to the Holy Spirit as "She." 

Acceptable? Sinful? Blasphemous?

If either of the latter two, citation?

Blasphemy. FATHER SON, male pronouns females not acceptable whatsoever. Man was made first then woman from man.

Blasphemous and sinful!

^^^^this. No citation needed.

Obviously, outside of the Incarnation, God does not have gender, but is above gender, but clearly God became incarnate as a man, and not a woman.  In addition, per Sacred Scripture and Tradition, man is the primary creation, and the "head", whereas woman was derived from man and is in a way subordinate to him.  So, to refer to God (any Person of God) as a female is effectively to characterize Him as being in a subordinate role.  Feminists deny the subordination (ordering under) of female to male, and so any attempts to refer to God as female are basically yet another attempt to deny that reality and claim that man and woman (on the order of nature) are equal.  Now, in the supernatural order, as the Holy Ghost teaches us through St. Paul, there is "neither woman nor man", since the supernatural transcends nature.  But, on the order of nature, female is subordinate to male, so that is why it's a blasphemous insult to God to describe Him in terms of the subordinate nature.

That is one of the greatest errors of modern times also, that male vs. female are simply a matter of accidents, i.e. which physical genitalia one possesses, and thus simply consisting of a set of accidents, by changing the accidents, male can be changed into female and female into male.  There are ontological differences between man and woman that go beyond the mere accidents.  So when people try to characterize God as female, they're pushing this agenda that is contrary to nature and therefore are engaging in the Luciferian non serviam or insubordination to God's creation.  As mentioned before, God contains all the perfections of both male and female nature and therefore rises above them, but the nature of man is considered to be more complete, and woman's to be derivative of man.  In addition, man is the active principle, and female the passive.  After the Fall, the subordination became subjection, and that's actually a reflection of that which modern man is attempting to deny, that even before the Fall there was a subordination (an order).  Whereas before the Fall, this natural order was in a state of harmony, Original Sin disrupted the order and therefore God needed to force or constrain it by means of subjection (which was unnecessary before the Fall).

Thus, referring to the Holy Ghost as female is tantamount to attributing to Him the qualities of subordination and passivity.

I've seen a few leftist Catholics refer to the Holy Spirit as "She." 

Acceptable? Sinful? Blasphemous?

If either of the latter two, citation?

A bit of a tangent, but as best I can tell, it was Scott Hahn the Judaizing "convert" who started this nonsense with his comparison of the Holy Ghost with the Jєωιѕн "Goddess" Shekinah.

Hahn's conflation:

Upon the ark — on the propitiatory, between the two cherubim — was where the shekinah , or “glory cloud,” came down. Derived from the Hebrew word for “to dwell,” this was God’s visible manifestation showing that he “dwelt” with His chosen people. On the two occasions when the ark was enshrined in the tabernacle and the Temple of Solomon respectively (Exod. 40:32-33 and 3 Kings 8:6-11), the shekinah filled them in so spectacular a way that neither Moses nor the priests could enter in. Now the shekinah is identified with the action of the Third Person in both Catholic and Protestant circles. The descent of the Holy Ghost on the day of Pentecost, for instance, is seen as an antitype of the glory cloud overshadowing the Temple. https://catholicism.org/ark-new-covenant.html

See also: A Vatican Lesson on Shekinah Echoed by Scott Hahn https://archive.is/HldIR#selection-427.1-427.50

The Jєωs and their "goddess" Shekinah: https://archive.is/Iu1B6#shekinah

The Hebrew Goddess https://www.amazon.com/gp/product/0814322719/ref=as_li_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=0814322719&linkCode=as2&tag=httpwwwchanco-20 />
a murdering "goddess" analog! https://mauricepinayblog.wordpress.com/2011/09/01/operation-mermaid-dawn/

And let's not forget the guys at "the wall" porking their "goddess!

zivug, worshiping and fornicating with the Jєωs’ “strange gods”