She is going to bigger venues, interest naturally increases as the election gets closer. I don’t think the enthusiasm has changed any.
But if she couldn't fill up gyms a couple of weeks ago, wouldn't bigger venues make the "optics" worse - the same 200-300 people in a larger venue makes for more empty space? Temple is in the middle of Philadelphia - a fairly large city & the venue was filled by bussed in school-aged girls. Other rallies were the same.
I'm not saying they are Trump-sized crowds, but she is drawing thousands now - where are they coming from? Why all of a sudden after the debate where, by any reasonable account, she got her clock cleaned?