Amazon Delivery Driver Slipped On Ice On My Property Last Month, Today I Received A Notice Of Attorney's Lien In The Mail

(I live in Illinois)
Last month, it snowed a couple inches overnight and an Amazon delivery driver slipped while walking up my front steps the next morning. I have the incident recorded on video through my Ring camera - I was asleep, as this was early in the morning. Basically, she started to fall but caught herself (without ever actually hitting the ground or anything). She then proceeded to swear at my camera and knock on my door for 5 minutes before walking down my driveway and sitting in her car, where I presume she called 911 because an ambulance showed up afterwards and picked her up.

Today, I got a notice from a personal injury attorney which says they represent her "in a cause of action asserted against you for injuries sustained on the above date due to your insured negligence or fault", and that they suggest I "forward this letter to your insurance carrier immediately" because "they will be able to handle this for you"

Am I liable here? Do I need to hire an attorney, or am I supposed to just forward the letter to my homeowner's insurance like it says?

Thank you.