Baby RSV and now a cold?

My 2 yr old brought home RSV and infected my 7 week old (she was 4 weeks at the time) a few weeks ago and it was traumatizing. We were in the hospital for 3 days - turns out she’s okay. And she got over it. Flash forward to now - my 2 yr old has a cold for literally 24 hours on Sunday and now it’s gone: but my 7 week old is sneezing and doing some small coughs. I’m TERRIFIED. What are the odds of her developing RSV again? Is it possible it’s just a small cold? She’s in high spirits and feeding/eating great. Just the sneezing and some small coughs. Any advice would be great! Thanks mommas.