Be careful pre. I've been going to alot of legit spas and the occasional home service just for a regular swedish massage, and believe me, it's a natural occurence, you can interpret those as signs but it's still best to never assume. Safe bet is to wait for her to offer the es herself.
I recommend reading these if you really think shes giving you signals, so you'd know what to do in these types of situations.
Subtle signals
How do you know if massages come with happy endings?
Happy ending