If she emails you, respond as needed. If it's about something that needs attention, then answer her. If it's just "hi" then wait a little while. But you should not send her anymore, especially the just "have a nice day ones". Even if she doesn't see that as presure on her from you, it might get her to wonder why they've stopped. (Please remember these are just my opinions, and what worked for me, may backfire for you. You have to follow your heart.)
