Preschooler only playing with baby sisters infants toys?

Our nearly 5 year old daughter always plays with her little sisters toys. They’re all baby toys and she finds ways to entertain herself with them somehow. It’s not a *huge* deal but it’s frustrating when we, along with many family members, have spent so much money on buying her her own age appropriate toys. I don’t know how to go about this situation. Do I tell her she can’t play with them??? That feels mean? I ask her why she doesn’t play with hers and we never get a clear answer. She has tons of her own. Makes me not want t buy her toys anymore if she’s just going to play with baby teethers and baby ring stacking towers 🤷🏼‍♀️😩