Why can't I post a comment on my friends WordPress blog anymore?

I’ve been posting comments on my friends WordPress blog for about 6 months. Now all of a sudden I am unable to. The comment "send" button is frozen. I press it, and nothing happens. I have Google Blogger. I am entering the same information as always. I have had no problem commenting on other WordPress blogs. She has no idea why I can’t comment either. Any ideas?