some prices lowered

Yes she is

I have her, her accessories are so fun

Getting back with a quick update:
The seller responded saying she can't do anything and it's definitely the PO fault but she can offer me a 10 Euro refund which to I agreed and the communication went silent again.
Anyway I will leave her positive feedback and maybe cut a star as bluerose9978 suggested. Thank you for all your advices and kind words. Now I know how things work and won't be overreacting if something similar happens again

HoustonCollector72:
Thank you I still will keep them they are too beautiful to let go

As for a little update: the seller isn't responding which I think is a bit rude. But fallowing your advice I think I will let it go, I calmed down now and the positive thing is that after a "treatment" the card straightened pretty nicely, there are still cracks and dents but it looks a lot better than it did before.
And I've got another question: what feedback should I leave? I was thinking about a positive but now with the seller not even bothering to respond I'm confused. It doesn't matter what the response would be but addressing the case in any way is something they should do in my opinion. What do you think?

She's new to me and I just noticed she has candy corn for cutie mark - how cool

Great thanks for your words of advice they helped me get my thoughts straight. I calmed down and wrote the seller a polite message, sending the photos in it too. I'm waiting for their response.

Vintageg2:
I'm happy to hear that your ponies arrived safely and congrats for such a great haul Thank you for your kind words and yes I know how people send ponies but if they don't know what they are sending I sometimes let it pass. But here the seller definitely is aware of the value of the items he's selling.

Ringlets:
Thank you very much for writing how ebay's rules regarding  partial refunds work, I didn't know that. Double thanks for the advice of how to write the message, I'm glad I didn't do it yesterday when I was all hyped up and asked you folks for your opinion instead. 

Giving it more thought maybe the seller is not to blame here, maybe even the box wasn't too small - it just got violated so badly that it became smaller (it looks like that could have happened to be honest). I have photos of the box and the ponies before I packed them out of it, just in case. Maybe it all was just a very bad accident and I rushed out with pointing fingers  . But on the other hand I never had a box arrive in this condition. I had MOC ponies sent internationally in a bubble mailer (arriving almost "not touched"), ponies with card bent by the seller to fit in the box (it didn't cost more than 30$ so I wasn't making a fuss about it, and they bent the card in such an "easy to be fixed" way), ponies going on a detour but arriving safely. Bad luck I guess.
Right now I'm repairing the ponies: I straighten up the card, and bent out the plastic, put some books on the card and the edges on the bubble. We'll see how it works.

Love that Hip Holly it matches her perfectly