I also agree it isn't weird or creepy. Due to her separation agreement she probably isn't legally allowed to ask clients follow her or reach out them directly providing her new practice info. I'm not sure what country you're in but many times that is how separation agreements work for therapists, doctors, lawyers, accountants, investment brokers.... Now, if you call and ask her to have a session I don't see a legal issue. However, I can understand in your phone call why she didn't automatically say "hey, let's schedule you a session." as that could be seen as a violation.

So in the end, yes, call T and request a session! Be prepared she might have to say No and if she does please ask her why. Everything I and others listed, ie, she might have a full case load, have nothing to do with YOU.