@girdyourloins PreK = 4-5 years old. It's specifically referencing the year before kindergarten. This is different of course in different areas, but just an FYI if you're searching preK curriculum or materials online.
Early child education is very holistic - it's not just about numbers or literacy skills. There are several facets of education (kind of like school subjects) and math and reading are only a small part.
Fine motor skills and independent skills are huge at this age. You can't write your name if you can't hold a pencil, or draw straight/curved lines. You can't wash your hands if you don't have the strength to pump the soap. You can't dress yourself if you don't have the dexterity to thread shoelaces or button things. Play Doh, sensory bins, using tools to transfer objects is a great way to accomplish this.
Social emotional is also important. Things like recognizing expressions/emotions on pictures, switching from a self-centered perspective to recognizing others have thoughts and feelings that are different than mine, and actions have consequences - things I do affect others, just as what they do affect me. Processing and handling big feelings is also a great skill to learn, with calming techniques and mindfulness exercises.
Letterland is a great free curriculum and way to teach early phonics. They have a song for every letter, and stories surrounding that letters phonics. It's a popular curriculum in preschools and the kids pick it up so fast!
Math concepts like understanding that numbers have meaning (not just memorizing the thing you say when you're counting - it's a skill to know to stop at 3 when you've got 3 things), pattern recognition, and introducing number blocks are good here. I also like "stew" games where you count out items to make your recipe. You can dump, you count, you recognize numbers, and you can practice writing/tracing/adding and subtracting when that time comes. It grows really well.
I like Pocket of Preschool on TPT. Specifically, their stews and fine motor journals. It's curriculum that is easily adjusted for skill level, so you can move up/down based on where she is at. I've used it in my 3s classes really well.