Have to construct our own plan for ds2 for September ...
Current thinking is to go very, very slowly.
e.g.
Phase one just to enter school premises.
Phase two to choose a lesson each day (his choice) to attend.
Phase three attendance all mornings
Phase four attendance all days
Only moving to each new phase when ds2 is comfortable with the previous one rather than giving predefined lengths.
At the same-time you need to negotiate with school / your dd to put in steps to stop the likelihood / anxiety of the bullying happening again.
This might be:
Separation into different classes, somewhere "safe" to go to at breaks, an "exit" card from lessons to give her a get-out route if it is getting too much, arranging for her to go / come home from school with a friend.
I agree also with the poster above that the more you can do to teach your daughter the skills she needs to cope with bullies the better so lots of role-playing of situations etc etc.
Have you also talked to the Educational Welfare Officer for ideas - they can be helpful in our experience and should be able to tell you the options e.g. a short placement at a PRU may be needed to ease the transition back to school attendance.