You should NOT be dating.
You are not anywhere near in the right place love.
Your dd needs you to be a mum, IF her dad decides he can be bothered, all well and good. You need to date for YOU!
It will literally take YEARS before you should consider moving in with someone so therefore you need to take the time to get to know a guy, enjoy couple time.
Be happy with yourself, as you are. Understand that anyone who has you in their life is lucky to know you and that you really are worth waiting for.
THEN, tentatively start giving dating a whirl, don't fall for the bs, look for tell tale signs that the guy is a twat and if something doesn't ring true, end it.
Don't introduce your child to anyone for a good 6 months until you are sure that there is potential.
Enjoy being a couple! The most boring thing on earth is the blended family bit, enjoy NOT being Muuuuuuuuuuum for as long as you can!
If you think you can wind this all back and stop planning your wedding and future family for a second, take things SLOWLY!!
If you like the guy and enjoy his company and find him attractive, meet him again. You don't have to make up your mind in date 1 or 2 or even 6 or 10. It takes time to work out who someone is.
And your mother is a blithering idiot.