Toddler licking her palms. These things.

Hello, my daughter is 5 years old. Of late I have noticed that she licks her palms. On and off. She does it while playing, when washing hands with water and playing with water. I also saw her lick her uncles palm like a playful thing. This has started recently, 2 weeks back. She also drools while sleeping. She walks on her toes at home. With shoes and outside she walks normally. She started walking like that  her to walk normally. She's otherwise active, has no blood issues. We took tests sometime back. She takes a multivitamin fourrts b 5 ml everyday and a probiotic. I was worried there may be signs of autism or something but she's extremely social, very intelligent, talks to everyone, sometimes too much. Is this a habit that will go away or is this something I need to discuss with a paediatric doctor. Please advise. Is scary when she does these things.