Congrats on the new calf.
The most important thing is to be sure that the baby is nursing.
I would watch carefully until I am sure it can latch onto the udder,
and then make sure it is pooping.
If she is a new mama it might take her a little time to get in the routine.
I have seen plenty of cows stand off and protect their babies.
You could carry a stick with you and go out there and lift that little tail up & check.
Chances are the mama will come right over and collect her calf from you, maybe nurse it.
The stick is only if she gets really mad and charges at you. Which is RARE, but its good to have a stick, IMO.

You can just give her a little sting on the nose, and get out safely.