Clear mold tree thing growing outside of window

My mom just noticed these flowery looking things on her bedroom window (second story if that matters) they look like flowers with alng stem at the bottom and then more blooming of a flower or tree at the top. The second pic is the shadows they cast if the first one isn't clear enough. I think it's some type of mold but couldn't find much online as I didn't really know how to search for this. Would really like to know what these are thanks!