So if it seemed clean, and the mat you were on was wet, maybe it was because she cleaned it?
You had no risk for herpes from the massage. Even if everything was dirty, and hadn't been cleaned in between clients, you had no risk. Herpes doesn't transmit via inanimate objects, nor does any STD transmit via hands.
How was your genital herpes confirmed? Was it a visual diagnosis? Were any tests done - cultures? Blood tests? Herpes needs to be diagnosed with testing - many other things resemble it, and a visual diagnosis is often incorrect.
Herpes symptoms don't show up the next day. It takes at the absolute minimum 2 days. The average is 4.
What did your sores look like? How long did they last? How did you treat them?