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How long has this been happening for? Is it getting worse or better? Has it ever happened before this episode? Is there anything different in her environment? Has she had any trauma? Is there any particular time of day this happens or any activity that she has been involved in before it happens? How old is she? Is she spayed? What breed us she?
Thank you for the additional information. Although I don't believe it is an emergency, I do think you should have her in for an veterinary exam including an orthopedic exam. I wonder about the health and comfort of her spine and her knee caps in particular. It is interesting about it happening when you get home. Perhaps she gets extra excited when she sees you and tweaks her back or knees when she's jumping up and then has a hard time feeling better again. Her signs are consistent with pain and/or stress/fear. A vet will be able to help you rule out pain and if that is not the case, perhaps guide you in managing the behavior.