This is definitely the sort of story that one would expect to see on Ripley's Believe It Or Not!. I'm not certain I buy it, but I'm willing to grant it is at least possible, if only barely. It's 10% of her body weight for crying out loud. That first link has pictures, this has more details.
Well, it turns out it is true. This was linked from the second post. I just hadn't spotted it yet.