Baby preferring one side

Hi all, I am still having problems stemming from 2 plugged ducts in the
last 10 days. The nipple on the affected side has been really sore, and
although I have been nursing DD on that side, I think I have been having
trouble relaxing. Consequently flow hasn't been as good, so she gets
frustrated and unlatches (painfully), but is quite happy on the other side.
There are 2 issues here - should I nurse her only on the good side till the
affected nipple has healed, and then try and rebuild supply or should I try
and nurse at the same time as healing (hopefully)?

Also, when she unlatches on the bad side, she doesn't let go - she clamps
down (well up really since she has lower teeth!) and pulls the nipple, which
has caused grazing. I can't predict when she will unlatch, so I can't
unlatch her myself. An LC suggested remedying the behaviour by saying 'no',
but when I do that she gets upset and refuses that side. And I don't want
to give her the other side, as that is more like giving her a reward.
Aaargh. Does anyone have any suggestions? Do I just put her down for a few
minutes, and then try again on the bad side? What if she still refuses?

Thanks for any help - this is really starting to get to me.

Cathy