According to the Google Analytics Help, Google Analytics will track an unlimited amount of websites.
However, she's stuck at 50 and is getting the following message:
Add Website Profile » You have reached the maximum number of website profiles allowed.
Interesting. Is this a bug?
However, while there's a lot of convenience to monitor multiple accounts under one single account so as not to require hundreds of logins, it may be simpler in the future to use separate accounts in case you need to give clients access if they no longer do business with you:
I think its a good practice to have separate accounts for different clients, and you should have it with clients login, because if client for some reason want to leave you, then you want have difficulty giving him access
This is a good point, but I'd be inclined to request two things: if Google Analytics is unlimited, please let us know, and can we make it easier to separate Google Analytics accounts in the future without going through the Google team if the time comes?
Forum discussion continues at Cre8asite Forums.