The way I see it, pretty much everything that happens in good therapy should be for the client's sake. Your therapist should not be using you to get hugs or meet her emotional needs in any way. That doesn't mean that there isn't genuine love and care in her hugs but that they are happening to serve you, not her.

I also find that asymmetry in the relationship to be upsetting sometimes but I have had therapists who used me to meet their emotional needs and, suffice it to say, I'll now choose upsetting asymmetry over unmitigated clusterf~ck any day of the week.