Tell her not to ghost her friends for some dumb cunt. Unhelpful common sense aside, showing her some dumb online sites to meet people, or pretty much any recommendations from dad at this time will just make her cry more... seriously, daddy saying "you can find new friends at shitfuckwhatever.com" will just make her feel pathetic. Just be her dad for now. Hug her, say shit'll be alright, you're beautiful and smart and shit will get figured out. It'll take time bro, but just be there as a dad along the way.