My Poppy when he drinks water from the fountain or a bowl, will paw at the floor almost like he does when he is scratching in the litter box. My other cat Suzy when drinking from the fountain will bring her right leg under her left leg, almost like a crisscross and scratch the side of the fountain. Why Poppy or Suzy do this, I have no clue, but my vet said that it is just something they do and not to worry about it because they don't do it any other time, only when drinking their water and they are in good health. Poppy is 7 and Suzy is 10 months old. So these little quirks, that's what I call it, has no age limit.

But, if you are concerned because of Brenda's age, then phone your vet first and see what he/she has to say about it.
Also, believe me when I say that not one person is going to say that you are crazy or just being overprotected. If that was the case, then when it comes to our beloved pets, we are all crazy and overprotected and to me, there is nothing wrong with that. Any animal lover would understand this and as for the rest, they can all go to......well lets just say that they can take a flying leap. LOL!!!

Keep us posted and if you can, I would love to see a picture of Brenda.