I know of a few situations where the accommodation was actually retroactive, but it will vary. There needs to be medical documentation. Being in recovery counts, as does eating disorder or other psych. issues.
I think it is helpful if your daughter is willing to do a medical withdrawal from the school, which means losing the good grades along with the bad. Since she is in counseling, the counselor could advocate for her with the dean or whoever else would be involved.
I think W’s are preferable to D’s and F’s, but that is my opinion only.
A break from school does not have to mean returning home 