Ok, so she didn't sit the academic /music/sport test recently then? That rules out several Watford schools (assuming you don't live v close to one of the most popular schools, and she doesn't qualify for a place as a sibling, or because of being looked after or having SEN).
So you are left with schools where you will be looking for a place based on how far you live. You need to look here to see the maximum distance children lived from each individual school, and then work out how far you are from the schools using this, to see which schools you would have a realistic chance of getting a place at.
Given it sounds like your daughter didn't sit the tests, you probably won't be able to consider Queens, Parmiters, Watford Girls Grammar and Clement Danes (assuming you don't live near enough to get in on distance). So that leaves Bushey Meads, Bushey Academy, Croxley Danes, Westfield Academy and Francis Combe. I don't know about Reach Free.
You really need to be going on the open days for these schools, which seen happening right now. Bushey Meads was last week, Croxley Danes is tomorrow, the others are all imminent too.
I also assume you aren't looking at faith schools?