Old cow new calf question

I have a 13 year old Hereford cow that hasn't gotten pregnant in 2 years even though there's a bull with her. So much to my surprise Friday night I walk out there and there's a little calf with her.. she wouldn't accept it at first and we have to put a halter on her and tie her to a post. But now she's accepted it but she doesn't give much milk... would you say take it as a bottle calf or try and supplement it or just let it be. I'd much rather the cow raise it but I would rather make it a bottle calf and have it do well over barely get what she needs from this one

Old cow new calf question