Picture messages won't send between iphone and android?

I met a girl while camping and got her number, we have been texting but we're unable to send picture messages to each other. I have an iPhone 4S and she has an android phone. I can send pictures like normal with other people but when i try to send her a picture, my phone acts like it will send, and then it says that i must try again. I don't know how it looks on her phone but i'm not receiving her picture either. Someone please help!

Added (1). I'm connected to Wi-Fi and i also have 4G, she is not allowed to get any apps(such as snapchat, or kik).

Sometimes that problem could happen if you don't have Wi-Fi or your 3G/4G on. It happens to me all the time. But if it doesn't work out, try using Snapchat!

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