An English word name, you can’t get much cooler than Winter (pun totally intended!). Hopefully her personality will be a little warmer than her moniker.
Famous people named Winter:
Actress Winter Ave Zoli; pro wrestler Winter (real name: Katarina Leigh Waters)
In some Slavic languages, the word for winter is “zima,” which might make an interesting alternative name. Unless you associate it with alcohol, in which case you were probably a naughty teenager. We’re onto you.