What does it mean if a lady asks for your number instead of giving hers?

Ladies...I know when a guy approaches you there a variety of options of dismissing him nicely. After the guy asks for number and instead you say "give me yours" to the guy..how often is it you will actually text? Earlier I was chatting up a chica for a bit and she seemed fun so said "well I gotta go, but give me your number and I'll take you out for food/drinks." She said that's nice but give me yours and I'll text you. I asked her if I am just going in her trophy collection and she said no and she will text me. I usually don't give my number out but we have same kind of dog, she was laughing quite a bit, playing with her hair, made good eye contact...all good indicators. She also mentioned she had random guys try to friend her on Facebook and she just denies. I sarcastically said "wait that doesn't work?" smiling all along. Ladies what are your thoughts? PS she works at gym I go to so If know I will run into her again but was first time seeing her there.
What does it mean if a lady asks for your number instead of giving hers?
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