Geez. What makes anyone on the Right think Miers is pro-choice? You'd think W nominated Hillary for the SCOTUS! Take a breath. Or a pill.
The only evidence we have is that she once said she was pro-life in an interview, and she argued that the ABA board should not go on record as supporting abortion until it had polled the membership. We also have the inferential evidence that she belongs to an Evangelical Church.
That's not enough to be certain by any means. What we need, at a minimum, is someone willing to overturn Roe v. Wade. That was tried, once, and instead we got the Casey decision, which contains some of the most rebarbative language ever issued by SCOTUS.
For all we know, maybe she's "personally opposed, but."
What does it matter if she is pro choice or pro life? We don't want an activist judge. We want an originalist.
Those fixated on overturning Roe really miss the big picture. I don't think any jurisdiction in the USA would outlaw 1st trimester abortions outright, after Roe is overturned. Overturning Roe doesn't make abortion illegal.
Those fixated on the supreme court declaring abortion itself is unconstitutional and illegal just want their own brand of activist. Why not consider sending a donation to the Taliban - that's more their speed.
What makes you thing she is?