She hasn't went to the stairs since yesterday

and we've had 3 accidents today...we always have more on Saturdays since she isn't gated in the bathroom for half of the day.
I'm going to try to bell train her. I've bought a bell like the ones that restaurants use in the window when food is ready. Know what im talking about?
The problem is, she's afraid of it. I've been trying to get her used to it by ringing it a few times. She'll take a treat off of the top of it but if I ring it she runs away and barks from afar.

and she HATES when i take her paw and make her ring it.
So....I'm not sure this is going to work out. I just want an easy way for her to tell me she needs up the stairs to go potty.