[Lamia]

Hey there! Others have already given you really good advice, but I did just want to add that even if your mother is angry, that doesn't necessarily mean the end of the world. Perhaps, after telling your mom, it would be a good idea to have your mom sit down and meet this girl (I'm assuming you skype or use some form of video chat.) as this could help your mom if she has fears that your girlfriend isn't real or just some "creep on the internet"

It's definitely a tricky situation, but I think your mom is actually more likely than most to handle it well, from what you've told us.

It might be a good idea to not do this all at once, too. You could start by talking more about you being a lesbian, so that she remembers and is used to that by the time you introduce her to your girlfriend. It might be a bit much to tell her "Hey mom, I'm a lesbian, and have you met my long distance girlfriend?"

I hope that this goes well for you, and know that we'll be here to advise and support you, no matter how it goes