Rent paid by someone else

My tenant, a woman on her own with 4 children, has had difficulty paying the rent. Her benefits have been stopped/reduced and she is challenging that. She told me she is struggling and I agreed to let her pay in sections over the month which she has done and she is up to date. The last rent payment came from a totally different name and I asked her who it was who paid the rent: A friend she says. If I take rent from a friend does that give this friend any rights or am I worrying over nothing? All advice is welcome.