not my bird, feather plucking? not sure how to help from afar

[rosietpoes]

looking for advice, not sure what stage this would be considered and how long it’s been occurring. my mom’s bird and i do not live with her. I didn’t see any bald spots? just fluff. she’s about 2-3 years old, my mom says she refuses to take baths and noticed the plucking a week ago which i dont believe. she thought it was molting. feather loss also visible on back under wings. any help is appreciate tyy