Xbox Live MCPE 1.9

Me and my friend are trying to play on the same survival world, but I cannot seem to join her world...

Previously, we were able to play on the same world. Now, she can connect to my worlds, but i can not connect to her’s. I have tried turning my device off, and on again, i have tried logging in and out of Xbox, i even deleted and reinstalled minecraft... but It still doesn’t work

She is also running MCPE 1.9 and also plays on an iOS device.

I have looked and have not found any solutions to this