AIBU to cancel the babysitter?

[Babysitterwoe]

We arranged to meet a new babysitter this morning and have her watch our DD for a few hours. 20 minutes before the agreed time we receive a text saying she'll be 10-15 minutes late...not ideal, but fair enough?

She's now 45 minutes late, no answers to phone call or text. WIBU to say don't bother (will tell a white lie saying we have an appointment so need to go out so it won't work now as she's too late). The truth is of course we want someone reliable that will turn up at least vaguely on time, I can't figure out whether I'm being incredibly rude to cancel like this and should give her the benefit of the doubt? So disappointed as having a difficult pregnancy and desperately hoped we'd found someone reliable .

[Andrewofgg]

By definition a good babysitter is 100% reliable. She is not 100% reliable and is therefore not a good babysitter. It really is as simple as that.