It also depends on what style of music she wants to play. For classical a nylon string is better and for pop/folk a steel string is better.
Personally I wouldn't buy a guitar on line. Whenever I bought a guitar I wanted to hold it, give it a play, see how the action felt, hear how it sounded.
If you can, take her to a guitar shop or two and let her try different ones (with the caveat of your budget!!), hopefully she'll find something she's comfortable and happy with.
A tuner is pretty essential and if you want a good one then a chromatic tuner is best.