Your friend has a preference for communication style. Someone who doesn't meet her expectations isn't a "red flag," just incompatible. Many people would say she's being clingy and needy, and call that a red flag. I would feel like someone was trying to love bombing me if they were checking in too much very early in the talking stage Personally, I think it's *healthier* to not immediately center your entire life around a stranger you're still trying to get to know, but to each their own!

Your friend has at least some degree of anxious attachment

She wants a stalker, not a boyfriend

Depends did she express that to the the person she’s dealing with and is she just dealing with that person cause I often seen younger women ask for this while letting others pursue them which is a red flag in itself