Daughter is potty trained!! Well, for the most part. Please, any advice for the advanced potty training part

I say “advanced potty training part” because, our daughter, nearly 4, is fully potty trained in using her little girl toilet. We want her to start using the big girl toilet now. But, maybe it’s still too soon? She’s been using the little potty for about a month now. Cleaning the potty basin is a real pain, and sometimes, she misses, and urine gets everywhere!Any tips on this? If it is still too early for the big potty, I’ll continue to positively enforce her using the little girl potty until then. via /r/Parenting http://bit.ly/2HNyiUh