I always forget to invite my own DP to things! I'm sure she didn't forget *about* you, she just forgot to invite you, if that makes sense? Like she assumed all along that you would be going, but forgot to actually tell YOU!
I do this too. My dh and I always argue because I swear I've told him but I haven't lol
Sounds to me like she may have forgotten you originally - but I wouldn't take it personally, there's a lot going on when you're organising parties! I agree if she didn't want you there she wouldn't have even mentioned it, so I would just go.
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