I'll implement the 'tease back' strategy, plus I will also mention that I've noticed that she's treating me worse than usual lately.
This way I'll gather intel both from her emotional and logical reactions, and will try to make up a single model of the situation.
I am far from an expert in these matters, but would advise against both teasing back and saying explicitly that you interpret the teasing as "treating me worse than usual".
[EDITED to add: To be clear, I mean "don't do both of these together" rather than "both of these are individually bad ideas".]
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