frozen breast milk?

Aly • Happily married. MC 4/2015👼🏻Baby girl 10/2016 💕 baby boy due 2/2018 💙
Hey girls,
So I have a huge stash in the freezer but I'm getting super discouraged because it seems like my lo is put off by the frozen milk! 
I thawed some yesterday (she's been cluster feeding and sometimes a bottle just saves us both some tears at 12 am!) but she would make this face of disgust when I'd give her the bottle and spit the nipple out. I also noticed it has an odor of freezer burn (although it is stored properly in breast milk freezer bags). I read this smell can be caused by an enzyme that breaks down milk fat. 
Has anyone else experienced this? Can I expect her to always respond like that? Anything I can do going forward? You know how valuable this stuff is- id hate to waste it!