>On her old adrioid phone (tied to her google account), I saw Chat enabled. So, I have disabled it. Now, messages don't show up on her old android device.

But, I think her other friends who are on android when the send a text, is not coming though successfully into the iphone. The android sender seem to be getting a not delivered. (Now, I can't ask all her android senders to disable chat in their messaging app :))