Would a stomach tube cost so much that it would put someone into serious debt? As well you have to consider her age in regard to the stomach tube remedy. Reasonably, how long will it stretch out life? I think that some consideration would be appropriate if you need to buy time for conversion, then do it, within reason.
The word was feeding tube, not stomach tube. It's not a matter of cost, nor is it medical treatment "to stretch out her life". My understanding is that a simple drip would suffice to keep one hydrated. Death by dehydration is known to be particularly distressing. It is simple common sense and decency that a hospital should treat the patient with the respect to which a human being is due.
Catholics need to know these things before the event, so as to be prepared.