You said "she didn't seem to recognize me"
Even if she recognized you she wouldn't say shit, because you were a client and she wouldn't want to risk outing herself at her workplace. Her best option would actually be to ignore you and not acknowledge you in any way, shape or form in the hope that you too would exercise your self preservation instincts and not risk shitting where you eat. Like a nuclear stand off.
You saw her more than once? - I bet she knows exactly who you are.
The most likely option of you speaking to her about this is that she's going to ask you to keep quiet about it which will put you in the indiscreet category. If you make a booking with her and show up to her house as Lex aka "Joe from accounting" who knew it was indiscreet but couldn't help himself - that's going to be weird too.
It sounds like a nice fantasy but the cold reality is likely to be much different, you have no good options, best to leave things alone.