Question regarding estranged beneficiaries on insurance policy

My dad died in 2022. I got a letter the other day stating there was a small $5k policy i didn’t know about and they just found out he is deceased. They state if they don’t get claim statement from me and his sister, they will send it to unclaimed property (IL)

The beneficiaries are me and his sister. We don’t have contact over some family drama after his passing.

I sent in everything i needed, but wasn’t able to get contact with his sister to let her know to fill the stuff out and send it back.

Will the insurance company send me my half, if they don’t get her statement?

Or will they send the whole $5k to unclaimed property?

If it goes to unclaimed property, can I claim my portion myself?