Could be still pregnant after light bleeding and cramping?
That sounds like to much blood for implantation bleeding. However the light period is strange, a light one is one thing, but a one day period is something completely different. You can try to test again (make sure that she uses her morning pee, it has the best chance of getting an accurate result), tomorrow. Honestly though if she isn’t pregnant you may want to try to get her into see her obgyn. Hope you get some good new soon. Baby dust to you!!