I'm not keen on Estelle, I don't find much about her interesting ( I feel like that with quite a few of the HM's.) But I did actually feel sorry for her when she was crying. I do feel she is playing the sympathy card, because this will get you support, however annoying/unlikable you are, but I don't think she was playing it then. Maybe being extra chummy with Ava, it actually made her feel a bit better and getting 19 noms was a cold reminder that nothing had really changed.
When she first got nominated she actually looked really shocked she was picked (Sarah did too, but that's by the by!) So I would imagine she had quite a big fall when she first got nommed and maybe she's still trying to get her head around the fact they're really not keen on her. I think it really was the amount that got her and the fact that Bradley only had 14 and George with 6. Getting 19 most probably seemed a really big number compared to the others.