I don't know the processes either, but I am guessing that there is a ton of "chatter" going on, via all available sources of input, to each senator's office, during a confirmation hearing. There might be various "this Kavanaugh dude didn't pay me when I painted his house, here are my invoices as proof", sorts of incoming messages. Assault and attempted rape isn't on that scale, but anonymity is a negative, and there might be a dozen accusations at a given time that need to be fleshed out in one manner or another before telling the committee chair, "I think you need to know about this." For all we know, Ford asked her not to, until she was sure she herself could carry through. I just expect that the everyday complexity of being a senator makes it hard to guess whether an approach was anywhere near the worst. Kavanaugh's the one who wants to be approved for high office, so it's poor form to be complaining that someone with possibly criminal evidence didn't do it right.