Gonna be the guy that says it.
She's likely faster, and strong enough to hurt him. The Goku that beat Burter up was around class 20. At her high end (inconsistency plagues both verses, MLP largely due to Depending on the Writer and For the Plot) she could beat him up.
This thread is still stupid, though, for several reasons.
1. Because we don't know for sure how fast Burter is, other than that Namek Goku rapestomped him. He was apparently super fast, but it's informed ability.
2. His DC is also way, way above hers due to his Ki, he can likely destroy the battlefield entirely before she could KO him.
3. In character it'll take too much pushing for her to be willing to hurt him badly enough to incapacitate him, so she's practically forfeiting the fight.
Burter wins... its like stoopid... Krillin and Roshi were so fast they couldn't be seen at the first Budokai Tenkaichi in the Dragon Ball series. And Burtur who is a fast and strong character In the Namek saga... Would probably be faster than superman and flash. (Shut up its the truth).
Now this.... against Rainbow Dash (granted my only favourite character in a crappy cartoon)... its kinda unfair.