I was trying to reply to a user whom sent me a message. When I hit the send button, I get a pop-up that says "Too Many Messages". What does that mean? I have too many? Or does she have too many?

Why did I encounter an email limit?

"We had to place a limit on first-contact emails because of spammers.
Basically, this cuts down the number of first-contact emails that
one can send within a two-to-three-day period (we can't divulge
anymore information about this limit). However, a member affected
by this limit will still be able to send an unlimited number of emails
to those with whom he or she has already had some back-and-forth.
It should be noted that MinglePlus members are exempt."
http://mingle2.com/welcome/faq_message

There is also another message limitation..if the emails exceed
a certain number and within a timeframe. This ones cures in minutes.

OK