She's laid an egg!
I have found a blog to go along with the webcam at Loch of the Lowes, so here is the link but I think I will have to find somewhere in the sidebar to make a more permanent link for that.
It is very interesting, and there is lots of information about what the osprey is up to, what is happening on the nest and why, and what else is going on in that area. Do have a look!
[Edit on Tuesday night - she's laid another one this afternoon!!]