first cold (probably RSV)

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My poor baby started coughing and sneezing a lot on Monday evening and has progressively gotten worse today (Friday) we decided to keep her home because her cough sounded worse than ever and we went to the doc. They tested for RSV which we won't know until Monday but started us on albuterol treatments (fun! Not lol). My
Daughter started daycare on the 18th and there was apparently a case of RSV on the 12th and then the 17th so I'm sure that's what she has. Now I feel guilty sending her to daycare with what I assumed was just a slight cold 😞 she's 3 months so she isn't able to touch and put everything she sees in her mouth yet at least. 
Anyone with experience know how long it took for this sickness to clear up? And prevent from recurring? We use a humidifier and keep her elevated as much as possible (in the rock n play or bouncer if we arent holding her) and also doing the nose frida which she hates. I was hoping we could dodge this!!