Hi, welcome! Sounds like she is ahead of the normal development curve, especially interesting is the 'knows the alphabet' part you mention, but that in itself can mean a lot of different things.
I would also recommend reading at
Hoagie's Gifted it a really great place to start and continue reading up about giftedness. Until a child is old enough to need testing for educational or other decisions, you might not be able to come to a definite conclusion, and that's ok. If she seems to need more stimulation, information, answers to questions the recommended advice is to follow the child's lead and you will be doing right by them. Good luck!
