She comes at a random moment. For me she came on a friday then was gone for 2 weeks and returned on a monday then was gone three weeks and back on a wednesday and then was gone 2 days before returning for the last inspection.
Either you TT one day and another and another slowly and hope you catch her or you just wait for her to show again.It's randomized so there's no set day or amount of time to pass for when she will show up.