Can't send picture messages from my android phone to iphones?

I have an Android phone and my mother has an iphone. I use to be able to send her pictures but within the last several months she says she hasn't received anything. On my end though it says the picture was successfully sent. I'm wondering if there's something wrong with either of our phones or maybe a setting we haven't thought of. Any help would be great.

First check you mom iPhone if she has received the picture. By mistake she had change the setting and picture must have been save in another folder or directory. Also check the folder of Bluetooth or whatapps if there limit is not exceed delete some picture and try to save some new picture.

Try this Apps and Follow this Step:
Download the Bump for Android app from the Android Market or by launching the market on your device and searching for "Bump"
Launch the app by clicking its icon from your device's homepage
Select what you want to share via Bump by tapping an icon from the tabs along the bottom of the app
Click the Attach button to add content from your device
Launch the Bump app on the iPhone you want to share content with
Bump your iPhone and Android devices together by gently tapping one against the other
Select "Yes" on your iPhone when prompted to confirm the connection

Its your phone service. You should get a hold of them As soon as possible

Maybe she changed her number and didn't tell you because she didn't want to receive any more picture messages.