Had a girl over last night for drinks, third date, and we had sex, no LMR. She is going away with her family for about a week, and we agreed to meet again when she returns.

I personally don't have a hard and fast rule when it comes to texting after sex. In this case, I was thinking of sending her "I had a good time the other night, enjoy your trip" tomorrow as a follow up. Would you say this is necessary, given that we've spoken already?