3 month old self settling.

My 3 month old wont fall asleep on me anymore and even if she does the second I move to put her down her eyes ping open like she was just pretending. Then shes awake. I was thinking would it be okay to put her down and just let her fall asleep on her own as long as shes obviously not screaming. I may let her whine a little bit but as soon as she starts crying I would soothe her asap. Would this be okay as I know shes still young it's just hard to get her to sleep and to keep her asleep.