Could be just that she's that much more aroused with you-- or depends on where she is in her cycle.
Chicks' bodies change and do weird things. I'm betting you're fairly young -- if it isn't a very weird color and it doesn't smell really bad, she probably shouldn't worry about it.
Otherwise, she should be going to see her GP for paps regularly anyway -- get her to mention it to her doc on her next visit.
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