My iPhone's iMessage isn't working properly

Hi! I'm having a real issue with my iPhone and iMessage. For a VERY long time, my mom and I have both owned and used iPhones, and, consequently, iMessage. Well, recently she betrayed Apple and switched to Android (gasp!). Well, since then, I can't send ANY texts to her! This is because my iPhone (4S) won't detect that it is an Android, and I have to manually send each iMessage text as a regular text message. It's a real nuisance, and I was wondering if there was any way to fix this?

I made sure her contact is no longer associated with "iPhone" contact and her number is listed as "Mobile" instead of "iPhone". And when THAT didn't work, I created a new contact completely, but it STILL recognizes her number as an iPhone number! Please help me if you can!

Added (1). My Mom currently has an HTC DROID DNA and I have an iPhone 4S.

I tex bombed my friends iPad and his message didn't work but he turned it off for a full 24 hours and it was fine if not take to store apple website help is not good

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