Hi,
I agree with the others. A guitar from Costco is not the best idea in the world.
I've tried out a couple of them there and was not real happy with the playing quality. the strings are hard to press down on cheaply made guitars.
If you have a Guitar Center store in your area or can order online I'd suggest something like this:
http://www.guitarcenter.com/Daisy-Rock-Debutante-Rock-Candy-Princess-Electric-Guitar-Pack-514876-i1372102.gc
for a young girl, she might like the "girlie" design.
Although I'm not certain of the quality of the guitar.
A better bet would be:
http://www.guitarcenter.com/Fender-Stop-Dreaming-Start-Playing-SE-Special-Strat-Pack-With-Squier-SP-10-Amp-104486238-i1177837.gc
If you can buy it in person, have the store set up the tremolo bridge for you. the tremolo is also known as a "whammy bar" . The guitar will come not set up for that, although it will still be completely playable.
You don't have to use the whammy bar at first, but it will be nice later. and it does take a little effort, not hard, to adjust the spring tension so the bridge rides correctly.
But the Squier guitar setup properly plays very nicely, I have one myself as a travel/practice guitar and it's nice for a cheap guitar.
Also you might like to take a look at this company based it Canada, I believe, www.Rondomusic.com
since your daughter is only 10, A "short scale" guitar might be better for her. A short scale guitar is mad on a smaller scale so it is easier for young people and people with small hands to play.
I learned on a short scale acoustic guitar when I was young boy close to her age.
this is a nice little starter pack:
http://www.rondomusic.com/sst5734vwhpack.html
Their guitars look fairly well made.
Here's a "girl" guitar kit:
http://www.rondomusic.com/product2276.html
Take a look at the first two or three pages of the sites electric guitars.
there are a lot of short scale guitars there.
The prices are very good too for a beginner guitar or set. If she loses interest, you won't be out a ton of money.
You could also order a guitar from them and get this amp for her from Guitar Center:
http://www.guitarcenter.com/Line-6-Spider-III-15-15W-1x8-Guitar-Combo-Amp-103944831-i1168996.gc
That amp is the best little practice amp made, in my opinion. I own one myself, and it beat all the others it's size in price and sound. It has a bunch of neat little effects settings that your daughter would like.
It can be used for very pure guitar sound or for heavy metal guitar sounds.
Also guitar center has a short scale squier Strat:
http://www.guitarcenter.com/Squier-by-Fender-Mini-Strat-Electric-Guitar-102084118-i1146336.gc
or
http://www.guitarcenter.com/Squier-by-Fender-Hello-Kitty-Mini-Strat-Electric-Guitar-512078-i1167425.gc
Also at guitar center is the "bullet" Strat, a full size guitar like the one in the Squier starter pack.
I hope she likes them, I think a small scale would be the best choice for a youngster.