Swallowed the red pill recently, but still digesting.

The backstory: I dated this one girl not long ago. Amazing first impressions. Despite some red flags and crazy 6th sense warnings (nightmares often when sleeping with her, shitty occurrences that could only happen because I was with her, etc - skeptics can laugh, but a sign is a sign. I also meditate often, so my perception is heightened), I stuck around because I was starved for female attention. Over these several months of dating, her attitude changed (as expected), my attempts for sex were shot down more and more often - the typical female opportunistic mentality of why should I put out if i'm still being treated well. Lots of manipulative tactics, some lies too. You get the gist. My interest is dwindling, she sees she can't effectively keep me around with her charms anymore. Fast forward to her dating a friend of mine and me ending up broken hearted. I think she might've felt some guilt from it (still very questionable) and I also ended up getting a job thru her that really suits me on many levels of my experience and expertise (she obviously talked me up to her bosses). In my mind this job was her recompensation for my broken heart. We work together, but I try to stay as cool as possible and not side with her on anything.

Last night I find out that she manipulated my friend all this time (what a surprise!), she "accidentally" got pregnant - even though she's supposed to be on a pill with very improbable chances of conceiving. I met with them both one by one last night, obviously the story of each one is different. She's accusing him of being a total dick and unwilling to stay with her to be a father, dropped some lines about "needing a decent father figure for the baby" and some other BS thru lots tears obviously trying to make me sympathize with her. Also got a sense that she might be fishing for some assurance that I will be helping her through this, due to being a sensible individual. I kept cool, spoke my mind a couple of times (honest feedback), encouraged her to stay strong and that was that. His story matches up with my own doubts i had while I was dating her. And also he's not against taking care of the kid - his exact words were "I actually don't mind that she's pregnant and I will even take care of the child, but it will be on MY terms" - you probably see why he's being a "dick".

Now here's what I am very wary of and I have a sense that it's coming, judging by the conversation last night: she will most likely try to leverage the fact that she got me the job to try to steer me into helping her out endlessly (guilting me and playing on my sensibility). I have to work with her, so there's also a great chance she might be manipulating our management in relation to myself if things won't be going her way. My work attitude is highly professional, my skills speak for themselves, so I feel pretty secure there, however seeing how manipulative she is, I am worried that she will be undermining my stance over time because I decide to stand my ground and stick to my values. What should I do if/when this starts happening? I don't want to be dragged into this or risk losing my job because of her. Working with a nuclear poisonous bitch is not an appealing concept.

TL;DR I date a dishonest girl, she lands me a job, she leaves me for my friend, he gets her "accidentally" pregnant. She is probably going to try leverage the fact that she got me the job or that we're "still friends" to manipulate me into taking care of her and the child. What do?

Edit: should I give her an ultimatum that I will stop talking to her if she tries to manipulate me?