ahh, glad i have been of some help, thanks for your nice words.
I have been scratching my head today trying to think what i did to encourage ds to feed from both sides and i can't really remember any more! Sorry.
Is your dd latching on at all to your left side (in the day, when awake)? My ds would have a couple of sucks then break off crying and i would swap over. we had a phase when he wouldn't even go into nursing position on that side. i think i did a while of feeding on preferred side first, then swapping to unfavoured side when let down had happened, then swapping back when he got fed up and that worked for a bit, but then i changed to the less-favoured-side-first at every feed approach, which i have done now for months.
how about feeding in the bath with her? that seemed to sort many problems out for us. Obviously not possible for every feed, but once a day might help get a good feed in from your less favoured side. (and great that she is taking that side at night).
i can't rememebr at what age i started giving him a toy to hold whilst bf to distract him when waiting for my slow let down, but you could try that. be careful though, i once picked him up with a spade from the sandpit in his hand, bf him and he gave me a nasty smack between the eyes with the spade!
one of the bf counsellors at a group i went to had the same sort of problem, and was still bf from both sides at 18months so that gave me encouragement.
x