Black cat missing

Our cat, who is usually in and out of home all day, hasn’t been seen since early this morning. She has a cat friend who visits every evening and he’s just been around looking for her so I’m worried she is lost or stuck somewhere.  She’s a small black cat with a tiny bit of white under her chin. She was wearing a red or blue reflective collar with bell although she often loses them. We are on Effingham. Last time this happened she was stuck on a roof - think she’d climbed up scaffolding. Please let me know if you see her.