How to not offend mother in law?

My husband and I recently turned our basement into a family room and game area for the kids. Last weekend while his mother was over she was looking at what we had done and loved it and I told her we weren't quiet finished yet we still had the furniture to get for it then we would be done. After she left we didn't think a lot about it until later that night when she called and said she wanted us to have the furniture out of her den. We really appreciate what she is offering but that furniture is not tough enough to withstand the abuse from our three kids and their friends. It is a really nice couch and recliner but it is an off white suade furniture. I feel if we take it and it gets ruined she will feel we didn't appreciate it but that type of furniture and kids is an accident waiting to happen. She already thinks I have a problem with second hand things which I don't I just like being reasonable. How can we say no and not start a war.