What are some good questions to ask a friendly acquaintance (to keep up email correspondence)?

I have a friendly acquaintance from HS who has recently started “talking” (emailing) me again. There is no bad blood between us, but we were never “besties” or very close. However, I value her as a friend, and it sounds as though she could use a person to talk to.

What sorts of things would be good to ask to help keep our email conversation going?

Thanks in advance!