Skin Lifting

I have a client that came in for a wax. I use GiGi honey wax. She doesn’t use any forms of exfoliants, no AHA’s, no BHA, no retinols, no Retin-A. Plus she isn’t taking any medications or has any medical conditions to contribute to the problem. She is 35 years of age and hispanic. Her skin tends to lift when I wax her. Once on her brow and once around the lip area. She said that this has happened before.
She has facial hair covering her whole face that she wants to eliminate, but I am hesitant to wax her now. Does anyone have any idea as to why she is experiencing skin lifting?