Is This Going Too Far?

OK, so I'm male. There's this woman at work. I like her as a friend and get on very well with her. I don't want any more than friendship, and she is in a happy relationship anyway. They moved all the staff around recently, so she ended up sat on the other side of the office, but she would still email me every day to ask how I am. Just recently, I have taken some time off work as a holiday. She had my home email address and has started emailing me at home asking what I'm up to and how I am. Do you think that is going too far? A bit of chit chat in the office is fine, but personally I think it is an intrusion on someone's privacy when they email you at home. What does anyone else think? It feels to me that she has become too attached. How would you deal with it?