Gift for co-worker who has been let go

I have a co-worker who is a bit over 70 yrs old. The company allowed her to stay on because she has been here for 12 years and she was well-liked. She wasn't given any work and didn't ask for any, so she has sat at her desk for years doing a minimal amount of work. We are growing now and she has been let go, as she and the company are "going in different directions". She is getting a severance package. I am the Office manager, and I was given the task of setting up some sort of celebration for her. When I asked her what she wanted to do, she said she wanted a gift card. I sent out the email, collecting for the gift. I haven't received much. Someone said they thought it was strange that we were collecting.

My question is about people asking how much I've collected and if I think they should contribute more. (Side note: I work in a medium size law firm). I don't think I should share what has come in, nor do I think I should be telling people, if they ask if they should contribute more. Am I right?