How do you answer her email? Don't. Accept it for what it was.
I learned that not all emails or texts need to be answered. If you really feel the need to answer... a smiley ( )or a simple "Thanks" works. I would not get into a long drawn out response.
Remember... 180's... change what you would have done before.
“Things turn out best for the people who make the best out of the way things turn out” ― Art Linkletter