Sounds like she had RCS on her android phone and didn’t disable it before switching maybe
this post was submitted on 20 Nov 2023
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Please tell me more. Because I've been receiving messages on old android which is connected to only wifi
https://selfsolve.apple.com/deregister-imessage/
Disable RCS with the other link and disable iMessage with this link and try again
Worse case you can iMessage her with her iCloud email instead of phone number.