I'm in the middle of a complicated situation, and I'm wondering whether this is commonplace in academia.

Long story short: I'm an international student, and I recently completed my master's degree in CS. I had been working with one adviser (Prof A), I completed my course work in December, but since Prof A couldn't find worthy candidates to fill my place, Prof A told me that if I assist her with her research projects for one more semester, she will help me find a job. Fast forward two months, she told me in a meeting that she tried to help but she can't and that I should look for a job on my own. I recently asked if I could pursue a PhD in her lab. She said no, as she has no funding. I've successfully applied to a different lab (Prof B), only to find out that all professors are provided funding for first-year graduate students. Why would she lie about this? Is this normal?

The situation has since developed that I've been able to play my acceptance to Prof B's lab off of Prof A, and she was very happy to take me on now that I'm working on B's research; she clearly hopes to get research funding out of this new-found collaboration. This seems incredibly callous to me; she clearly has no interest in my situation, and simply wants more grant money. Is this normal behavior for academics? I was on the edge of being deported, and she clearly could not care less about my personal situation, only for her research money. Are all academics this callous?