Board Thread:Manga/@comment-44824745-20200108205736

According to this wikia her birthday is August 5, while in her bio:

https://66.media.tumblr.com/3c380252349f509758628de58563f59c/904fb43868c083d9-63/s640x960/b7d398d9e8a3a9e2f73fb935d1a258cf0d9a9fd8.jpg

It's revealed to be the 10th of February. 