Earlier quoted context omitted.
If my job is sales and I hadn't closed a single deal in 4 months, I'd have quit myself. I'd either take the blame upon myself or I would have figured that this company already saturated the market, or has a bad product that nobody wants. The easy route is blaming someone else.
Do you not understand how ramp works? She would not be allowed to a sell during the first three months, or only with direct supervision. I'd be very surprised if you've ever worked in a sales first position, given this basic misunderstanding.
"She closed zero sales 4.5 months into a 3 month ramp."
She had 1 month, after 3 months of ramp, to close something. Based on that, alone... I'd still stick by my comments above. If she has even a single peer closing even a single tiny deal in that 1 month, then she's already at the bottom of the list.