L.S.
Sounds like a lot of drama to me. Written communication, such as email, is always hard to decipher. Tone or intent is very hard to pick up sometimes. Either ask her about it, or don't. Either be her friend, or don't. Don't carry this with you; there is no need.
This reminds me of the saying - Some friends are there for a reason. Some for a season. Some for a lifetime.
Maybe YOU were there for HER for a REASON. Maybe that reason is over, and so is the friendship. It doesn't mean it is any less valuable or that it wasn't a "real" friendship. You were probably a very good friend to her. That's an acceptable experience. Don't discount it.