My girlfriend says she feels useless and annoying?

Anonymous
Last night we were talking on the phone then conversation slowed as I got tired we said goodnight and she hung up. She sent me a message while I was asleep saying how she felt. She also said I didn't do anything but she wasn't going to talk to anybody for a day and clear her mind. Can someone tell me why she feels useless and what I can do, if there's anything I can do
My girlfriend says she feels useless and annoying?
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