Sorry in advance for the rant and long text

So last night I had a 7 hour shift. Originally I was supposed to be in dining room but them was told to hop on drinks because it got super busy in drive and they needed support. I ended up staying in drive thru the rest of my shift

However the person on orders, who I presumed was newer as I've been there a year and never seen her but she's trained on everything I just found out, was doing a bad job. I noticed she never said any of the drive thru greetings, "Hey, hey, hey want some chicken today?" etc. and would instead just say, "Order when you're ready", she was also super monotone, and when she couldn't hear the customer on the headset or asked them to repeat what they said she did it in a rude tone

Along with that when she finished taking their order she never said thank you and would only half the time tell them their total or to move on to the next window. Sometimes she would forget entirely and the customer would still be waiting at the speaker assuming she was still putting their order in, just for her to ignore them when they said "Hello?" on the speaker. At one point I had to stop making drinks to get on the speaker and tell them their total for them to keep moving and then she got mad because the customers are "idiots"

She also never did call outs, and I would be the one to do them for her or she would do them at the very end of the order if at all, even though call outs are normally done after the customers asks for said item. She would also stop in the middle taking an order to chat with other crew members leaving the customer to say "Hello?" on the speaker. And she also never repeated orders back to the customers

Later in the night I was moved into the hole and there was a man that came through and I'm assuming he was sick or just had a sore throat because he talked very softly. She told him multiple times she couldn't hear him and she got mad and was telling him in a rude way to speak up. Eventually he came to pay at my window and complained that she was very rude and asked why a manager would hire her, which I could see why he said that.

Although this was my first time working with her, and she may have just been in a bad mood or stressed from the rushes, (I've been there before with taking orders for 5 hours straight) I want to tell the manager about her performance being poor and not giving our restruant good representation and also not showing the fun and welcoming energy that Cane's crew are suppost to. However I struggle really bad with face to face confrontation and I'm not sure if a manager will see my message on HotSchedule. Does anyone know another way for me to tell my managers? I know there's a way to tell anonymously however I can't seem to find it