The APA says heck no and they make the rules for all the states...and if your T would like to keep her license she will tell you no as well. See beforehand and then the last paragraph sums it up, but even that 10.08b section covers pretty much EVERYTHING.
A T would basically have to be ready to do the equivalent of presenting a case to the grand jury, and this is 2 years post termination...because another T WILL tell the APA of their actions even post 2 years. Ts who date former clients are NOT looked upon well in their little T environment.

Sexual involvements with former clients: A delicate balance of core values