Blowing bubbles, rustling/playing peekaboo with a shiny survival blanket, sensory play with squirty cream or cooked spaghetti or yoghurt died with berry juice.
'Bowling' with home made discovery bottles, roll a ball down a ramp and show her how it causes the bottles to fall down. She won't have much clue about it yet but will enjoy the sensory experience of the bottles and playing with the ball, and you can have fun scoring points with the bowling!
Singing and playing with musical instruments, games like 'This is the way the lady rides' and 'Round-and-round the garden'
Reading, books with simple large flaps (the felt ones are good for this age) and sensory ones like 'That's not my...' are god for this age.
Treasure baskets, and exploring safe household items, more interesting than baby toys.
Going round to a friend's with a similar aged child, or ahving them to yours. Playgroup.
Going swimming
Going to the playground (she can sit on your lap down the slide, and will like the swings)
Flying a ribbon kite on a windy day
Exploring an obstacle course of couch cushions, pillows, and tunnels made with blankets over chairs
Going to the library. Our local one has toys as well as books.
Going to the shops, talking about all the different items colours, textures.
Dancing. You can make a living room disco by drawing the curtains and draping some flashing fairy lights around, and playing cheesy pop while you have a lovely dance together.
'Art' activities with squirts of different coloured paint in ziplock bags, well sealed with Sellotape, for her to explore.
Pretending you're both dogs and crawling around chasing each other, panting and woofing
Birdwatching. Hang a bunch of bird feeders in the garden and carry her out to watch them.
Go on a bike ride together, preferably in a park or woods with a cycle trail rather than the road
Forest school? You can get sessions for parents and babies