My personal recommendations would be to
A ) Make the subject shorter, like "Reason for Absence" or "My Absence"
B ) Make the email more formal. (You don't have to copy my recommendation word for word but if you want to or use it for reference that works):
"Good Morning/Afternoon/Evening Mrs. __,
I hole you're have a lovely morning/afternoon/evening. Today I was absent and I apologize for the inconvenience. The class meeting didn't appear on my canvas courses and I couldn't find a zoom link. If there's anywhere I can find either one for the future please let me know and again I'm sorry for the inconvenience.
Sincerely,
__"
Ill try but i think your reffering to Goosebumps.
Can you show me some pictures of the story?
It’s probably best to be straight up and ask. But if you don’t want to do that, you could just mention her up in passing. Such as “Hey did you see what Anna posted?” (let’s say Anna) or maybe some thing like “hey I literally thought I saw Anna at Walmart” and then when this person is somehow brought up, you could be like “speaking of which, I didn’t see her at the party? Everything okay?”