Not only does this increase the chance of getting to the potty on time, but it also makes potty training much more independent. (pottytrainingconcepts.com)
The ability to walk (beginning at around twelve months) is an obvious asset in getting to the potty in time to use it. (healthychildren.org)
I too am wondering if that might encourage her to get to potty training earlier. (confessionsofadrmom.com)