In reply to elliot.baker:
If she's new to hillwalking why go anywhere near Snowdon! As already said you'll scare her away doing Grib Goch and honestly there are better high routes in Snowdonia for a first timer.
My girlfriend has only started hillwalking this year, also fit and capable but absolutely no experience in the hills. 1st trip was a simple walk around Llyn Idwal to give her a taste of the area, then in March we did Glyder Fawr and Glyder Fach, snow cover from around 2500', clear day and lots of interesting and different things to see. She absolutely loved the cantilever stone, as a non-walker she'd never seen anything like it! Since then she's been up Bowfell and we're struggling to find enough days to get out ..... result!