It's very casual, not standard English. Possibly the person who wrote it would, if they read it back, consider it to have been a mistake. Possibly not.
There's no punctuation, so we shall need to guess where to put it, and it is missing some important little words.
She is literally out here, just flexing and proving to everybody how versatile and amazing she is.
There is much that is unclear. It's unclear what "out here" means. Perhaps it means "out (away from home) here (in my region)". It's not clear what "literally" means, is possibly means nothing, it may mean "not literally".
It's not clear what "flexing" means, my guess would be that it is metaphorical: meaning "showing off". But it's not clear how she is showing off, or how she is proving herself to be versatile and amazing.
So, no, without context, it's not clear exactly what it means, but it's clear that generally he likes her and thinks she is very good. (I'm not going to go all the way through the comment thread to work out the context).
When people write comments on videos, they will make lots of mistakes. It's normal. You shouldn't expect youtube comments to follow the nice standard grammar from the textbook, partly because it's casual and lots of slang will be used, and partly because people will make mistakes.