I'll throw out some of the signs my ex gave me.
-She arranges for the two of you to do something, in my case it was meeting her at a park to walk her dog.
-I was leaning against my truck while she leaned against hers as we talked, she left her car to stand next to me, shoulders pretty much touching.
-Telling you a movie thats in theaters looks interesting.
Granted, this are incredibly obvious, but I have a feeling she knew that she had to be obvious with me. Usually a girl can read that unless she's really inexperienced.