Cats helppppp

Ok so today I️ was at the ags station and a lady came to me and asked me if I️ could take this stray cat that’s in a rocky ditch area with her baby kitten if she could catch it I️ said yes and gave her my number and I️ went back to the place tonight to see if I️ could catch it I️ bought the kitten and it’s mamma a bed and blanket and took it some cans of cat food I️ almost caugh the baby but it was so fast I️ plan on going back there tomorrow to see if I️ could catch it can anyone give me advice on catching th mamma too she’s extremely fast and both hiss a lot because they are scared I️ don’t want to take the baby away and leave the mama because the lady that worked at the gas station got another person to take the other baby and take care of it so I️ would love to have both the mama and baby