Its possible she has posed with BF in an attempt to convince people (and herself?) that its all good with him now.
its possible he insisted on them posing together so he can say "of course i didnt do it- why would she still be with me/ go on the paper with me if i'd hit her"
Its possible she is still really confused about how to leave this relationship and considering that she didnt get support from the first port of call, she may have lost the confidence to actually call anyone else or try and leave again.