Is the girl in Yaz commercial same from Hi-5?

It's very likely you're thinking of Lauren Brant, who was a member of the Australian children's group Hi-5 from 2009 to 2012.

She did star in a Yaz commercial around that time, so you're on the right track!

While she's not in Hi-5 anymore, she's still involved in the entertainment industry and has appeared in various other projects since then.