Help! Frozen milk

Hello! I have a question and I’m really sad about this, I had a small stash for my baby in my garage freezer and I just went there to put another bag that I pumped today and some of the stash was unfrozen… I don’t know what happened, it wasn’t all of it, but a good amount, there’s bags that are half frozen but not completely, are those bags bad already? I decided to throw away the ones that are completely defrosted cause k don’t know how long it’s been like that and makes me scared to use on my baby… I’m really really sad about this since I produce just enough for my baby and I’m trying to build a small stash just in case I ever need to with her and it’s been hard work… I’m so sad right now I don’t know if all of it is bad now that is half defrosted or not or if I’ll have to throw everything away 😓… any advice? I decided to save some colostrum I have and it was mostly frozen but still a little soft I don’t know what to do ☹️