B.C.
I agree with Valerie. The botanical gardens are on University drive and the mini train is right outside the zoo on the same street. The gardens are free and the train like, $3 a person. It stops at the trinity river park where you can get popcorn and a soda for $1 to eat on the way back to the station. My kids love it!
The zoo has a new rock climbing wall that's $3 to do.
The parks mall in Arlington does have an ice skating rink and a carousel. I have a coupon for a free carousel ride and another one for 1/2 price ice skating if you want them. :)
If she took her daughter to the Museum of science and history, it would be $14 for adults and $10 for kids.