I stand with Loopy on this - I hate abortion but would never see the law in this country changed.
It's not my place to make such a blanket choice for anyone, not even myself, because I don't know what circumstances may be behind the choice.
I object to grown women using it as a form of contraception. I'm ninety-nine point nine percent certain that I couldn't ever do it myself but, as my husband says 'don't ever say never...'
In fact, I have an unusual viewpoint on this because, despite being, for the most part anti-abortion, two years ago I helped my then-fifteen year old sister with hers.
I took her to the clinic, I held her hand, I looked after her while she recovered. I hated myself for doing it... but she doesn't (and will never) know that.
It was her choice and, I suspect, given everything, the right one for her.
Two years on, I'm pretty certain I feel more guilty and more haunted by my involvement than she does, something that's been bothering me particularly since I had my own DD. She should have a cousin - she doesn't and I helped with that. But that's a separate thread.
Regardless of personal opinion on the subject, it is not one to make for anyone else. And this teacher appears to be doing just that.
Tell her, if she's so bothered about protecting unborn babies, to concentrate her efforts on tecahing decent contraception to these kids.
In fact, you might want to mention that notion to the Head in your meeting, OP. If there are two abortions already in your daughter's class, then there's an issue that needs addressing.