Is it okay to cancel an appointment in a timely manner?

[Waltzingmatilda]

Just wondering what is the consensus. I made an appointment with an escort Saturday night for Sunday about over 2 month ago.Something unexpected came up so I cancelled with this lady via text after 9 a.m. on Sunday. Didn’t want to text her too early but didn’t want to text too late as she could make other plans.
Is this reasonable etiquette?
I’d love to make an appointment with this lady now but feel she might be a tad annoyed. No reply from my cancellation via text, which was fair. I just genuinely couldn’t make it, as unfortunately life happens.