Thinking this is a pro-life issue is quite a confused perspective,,,
Is it moral to keep a 99 year old woman alive against nature, by artificial means because YOU believe in pro-life, despite her asking to be left alone to die?
imagine she is in great pain and suffering with no quality of life. Maintaining life against her will is torture for her, not moral.
This is why it is ethically dubious to maintain this fetus, the probability of a terrible quality of life is high, by prolonging the life unnaturally, you are not on a moral ground, it is a very uninfomred, unknown ground. I have done PICU and SCUBU rotations and the difference of hours in development makes a difference. At 21 weeks the doctor does not have to maintain life, at 22 weeks they are. This fetus was put on life support via its dead mother at 14 weeks.
This is very dicey ground. Again, it is being done without the desd patients consent or her living next of kin.