I gave her a bow to shoot things that are far away, like dragons, so she would pose some use to me in open areas.
She used to use the Orcish bow I gave her, but ever since I gave her the clearly better Falmer bow, she refuses to use it.
Do I need to give her arrows too? I'm fairly sure she had none with her Orcish bow.
If its using the same system as the FO3 companions they will have free ammo for their default weapons but if you provide them with better bows you'll need to provide the arrows too.