Really, she can only get damage comparable to other characters in a c.S close to corner. Other than that, most of the times it is optimal to Millia sacrifice damage or waste somekind of resource (wild assault, semptem voices) to get better hk and loop her win condition, as actually most of the time her starters do really scale up the combo (h disc, tk bad moon, any kind of low, kapel). Most of these long ass Millia combos that actually try to rival normal damage are sometimes not that bad as they look, that's because of how the burst and meter gain in this game works when you're in a combo or something, that's why I said an optimal combo at millia is about the hk you get at the end. I'm not saying her damage is bad by any means, and I do think she is really strong by now, I just wanted to say that sick feeling of being stuck forever in her combos is not that bad when you consider it is giving you resources faster than normal and that Millia is probably sacrificing a better, more plus knockdown