It's okay to be curious, and it's good to ask for facts about something like this where there's so much misrepresentation. I'm glad you're asking! And I've figured you're here in good faith, no worries. Thanks for making the adjustments with your language, too, I appreciate it.
You know, reason number three in that list is why until pretty recently (less than a couple centuries ago) the Catholic Church wasn't actually anti-abortion, something a lot of people didn't know. Because so many children were (as so many still do) suffering so much due to poverty, while they were not what I'd call pro-choice, they were absolutely not-anti, and were clear that there were absolutely times that abortion was the kinder choice to make for a whole family -- after all, one or more new children means less to eat for the existing children -- and for that potential child who would otherwise suffer.
I think that this is a lot less confusing when you realize that someone who is a doula is someone who care a LOT about *both* children and the people bearing children, and that's most often *exactly* the kind of person who also does abortion work, because those are the people most harmed when abortion isn't available, and when good abortion care isn't given. Much like I mentioned above, for example, I can't tell you how often the profile of someone having an abortion is someone who already has children, and who knows they can't afford another (be that economically, energetically, emotionally, etc), or who is in an unsafe or otherwise bad relationship or situation and where the children they have already make it hard enough to get out, and they know one more may make it impossible to get themselves and their existing kids out. Access to abortion is something that in so many ways is such an important thing for families, and doulas tend to be very family-focused. But again, your friend is the best person to talk about why working in abortion is meaningful to her.
By the by, she may not always be 100% comfortable with the work. Sometimes it's uncomfortable work, whether that's about people's situations (a lot of them can be really sad, including people who want to be parents, but where something just is or went very wrong, or people who have been assaulted or otherwise abused, or who are very traumatized by pregnancy, or who are not being supported in their choice by anyone in their lives), or something about the actual procedure. But sometimes we do things or help people do things we're not 100% comfortable with for greater goods, you know?
(Just a content note for folks reading who are squeamish about blood talk or medical or abortion description, I'm about to be explicit.)
Per what you see, it depends. Sometimes you don't see anything at all, because some styles of aspirators -- that's the machine the hose pulls those products into -- are opaque, so there's nothing to see. When you can see things, in most procedures, you're just looking at what looks like blood, or a clumpy looking period, or blood with mucus-looking stuff. Only in rarer procedures that are second-term and up (which are usually either because it took someone a long time to save up for or otherwise access one, or because something happened during the course of a wanted pregnancy, like developing a serious illness, or the pregnancy becoming unviable to even bring to term, or circumstances otherwise radically changing) then you can sometimes see some more solid matter, and the times I observed those, my impression of what I saw that wasn't, again, more blood and mucus-y bits, was that it looked kind of newt-ish to me. If and when you're looking at pictures of things that look more like actual babies, like you'll often see from anti-choice folks, what they are usually using are photos either from late-term miscarriages or from stillbirths.
Never doubt that a small group of thoughtful, committed citizens can change the world. Indeed, it is the only thing that ever has. - Margaret Mead