No advice but just wanted to say I hear you !! My little girl is doing exactly the same , she has wee’d on the potty twice and was so pleased with herself but hasn’t done it since and just says no not today maybe tomorrow 🤦♀️
100% as per the first comment read the book "oh crap, potty training", my little one went from clueless to dry in 3 days but you have to follow it exactly. In terms of wee, you kind of have to give them more to drink than you normally would but not so much as to flood them, when we first trained my little one she was wee'ing every 20 minutes until she got a bit more control.
Have you googled ‘oh crap potty training’? YouTube it too. It’s really good x