In reply to Spready:
Was up there today. There was quite a bit more snow overnight than forecast, although by Monday I'm sure all that new stuff will melt into the snow pack given the tempetures over the weekend.
I've not seen the exit to Tower Gully, but there are some large cornices developing in many areas of the Ben. Number 3 for example looked pretty much impassable.
Ledge Route might be a better intro route despite the higher grade. You'll be able to get rock belays and keep her roped at sections that are exposed or where she's uncomfortable being off a rope. Tower Gully I've always thought is pretty serious. It's a long way up Observatory, like any gully - hard to protect, it's steep for the grade and with Tower Scoop below, a slip is serious. Although Tower Gully gets grade I, I'm not sure it would be my first choice to take someone new to winter climbing up.
I'm saying this mainly because one of my first days winter climbing I went up that direction late in the season. I was well out my depth and ended up having to gingerly climb all the way back down from near the top.
All in, Ledge Route just has better views anyway!
Post edited at 22:05