15 month old suddenly weaned and I'm a wreck

Let me preface this to say, I was burnt out with breastfeeding but around 12 months it became effortless. It was our time. I felt the societal pressure to wean but I couldn't take it away from her so I didn't. A few days ago, she had a really rough night. She was biting me and I was frustrated and I think I scared her because I jumped when she bit me and she started crying. She nursed yesterday morning and that was the last time. She motioned and said it so I offered and she immediately bites me. She'll also paw at me and start crying and I feel guilty because I think it's my fault. I know not to react like that but it startled me and really hurt. I was kinda sad yesterday but I tried to keep a positive mind and if this is what she wants, that's so much better than me taking it away from her. But today, gosh I feel awful. I'm so sentimental and I didn't know that yesterday would be the last time and I can't stop crying. I did read an article saying it's totally normal to feel this way but it sucks. Something is up with her, she's been goofy for a while but I don't see any new teeth. I just miss the sweet happy baby I used to have. She's so upset and defiant lately.