My dds are older but when they were 3 their favourite things were
Doctors kit with real plasters and bandages.
Tea set and cake - the Melissa and doug wedding cake is lovely.
Happyland - in particular the London bus, Ferris wheel, rocket and fairy house.
My busy books (books with 12 figures and playmat) - favourites have been moana, paw patrol, Disney, superheroes.
Duplo.
Dressing up - favourite characters or superheroes.
Drawing - big pieces of paper and chunky pens or crayons. Or the colouring book with favourite characters.
Orchard toys games - tummy ache, shopping list were favourites. Also hungry hippos, and matching pairs.
Books - sue Hendra supertato, Dave the cat and pretty much all her books. Please Mr panda is good. The tiger who came to tea. The dinosaur who pooped series. Aliens love underpants.
Puppet theatre and finger puppets. We had fairy tale characters then the set of books to go with it.
CD player with audio books (Julia donaldson) and music like Mr tumble, Disney or nursery rhymes.