My friends DD was TT day & night at around 22 months.
My DD1 was 3 & 4 months.
My DD2 is 3 & 5 months now & not even close. She is still very wet in the mornings.
If I was you I'd let her go. She sounds way more ready to me than my DD2!
Those brolly sheets sound good, I'm off to have a sticky beak now too.