Well, the good news is there's nothing wrong. The bad news is, she's not currently pregnant. The vet couldn't tell me if she reabsorbed or it was phantom or not.
She was not my regular vet. Apparently he had to hire someone else since he took over the practice of another guy who retired. This new vet is a harpy! She basically tried to make me feel stupid and irresponsible. She told me since it had been more than 60 days, chances were she should have had them already.
She tried to strong arm me into getting Jezebel spayed immediately, since there's too many unwanted cats out there. I realize that, but these were wanted! And we're responsible. We don't let our cats roam, and I wouldn't have taken the cat in just for a check if I was irresponsible. Then she tried to sell me some extra products like flea control. Didn't check the cat for fleas at all--just squeezed her really hard, declared her kitten-free, and was rude.
So, thank you all for your support and advice and the like. I'm feeling rather stupid now for thinking she was pregnant and I know I'm a novice, but she fit the whole description of symptoms.

At least I've learned an awful lot, so I'll be better prepared for next time. We'd like to breed her once then fix her. We'll be responsible about it and those kittens will be loved. Meanwhile, I have to deal with my disappointment, but I'm glad she's healthy and there aren't complications.