Need some advice please.

So I lost a cow that has a 4 month old calf at her side. I'm going to have to wean her obviously. Just wondering if there is any extra supplemental products that I should be giving her since she is so young.
I could really use some help and thank you in advance for your advice.

That's really not that young for a calf to be weaned.  We wean plenty of our show and sale prospects around that age.  Just make sure she gets started on feed right away and she should be fine.