Boss Doesn't Listen to me

It's like everything I say goes in one ear and out the other. We end of having the same conversations at the same time every month because of it and she will argue me down that I didn't tell her something and I have to stop what I'm doing and pull emails and chats to prove myself.

I'm often talked down to and treated as though I don't know how to do my job.

I feel ignored!! Recently my colleague quit so I'm the sole processor for my work and my manager 100% adored my colleague and now it is very apparent she's making due with me. I don't like that!! I exceed at my job and I stay on top of things. They worked together for 11 years and she & I 2 years.

I'm tired of it and need advice on approaching her about it.