My friend can't join my MCPE server?!?

My friend keeps crashing when she joins my MCPE server despite she can still join other servers and that she was able to join it before...but now she

My friend keeps crashing when she joins my MCPE server despite she can still join other servers and that she was able to join it before...but now she keeps on crashing and can't get on for even a minute...!

or:My friend keeps crashing when she joins my MCPE server despite she can still join other servers and that she was able to join it before...but now she keeps on crashing and can't get on for even a minute...!

Tags:crashing,