Baby is more alert and responds to stimuli in the environment at this age. I suggest one of those playmats with dangling toys so baby can lay underneath to watch, touch and listen to the movements of the moving objects.
Honestly it depends on your budget . Most of the toys I buy , my baby doesn't play with it (newborn period) other then the playmats with the dangling toys . My baby gets fascinated with handkerchieves .
Your baby is exploring the world at 8 weeks - get her 1. A moving or music a mobile 2. Playthings that dangle overhead 3. A music box with moving figurine 4. Things to swipe or touch 5. Cuddly toys
For my boy we found the activity gym very engaging!