Clearly both providers acted professionally and both showed you a good time.  Contact between appointments is something that some gals do and some never will. If that's your criteria for choosing repeat appointments that's your right-it's your money.

The lady who is not responding to you may simply not do white listing-a lot of them don't.  She also may be taking time off and not checking her business email or, and this is often the case, she may be ignoring you until you contact her about another booking so as not to encourage a flood of emails.  Some guys have a nasty habit of blowing up a providers email with mindless babble in between appointments.  

In any case, it's your money to spend however you like but how she markets herself is her call.  What may seem like a "mistake" to you may be what works for her.