The facts support the reason ( 0 sales), although there are nuances ( timeframe - 4,5 months)
There's also a lot of missing context.
- what happened in those 3 opportunities that she tried to close a deal
- perhaps she's missing a technical background to actually close a deal, since Cloudflare is a very technical product
No one from us knows the details, so it's speculation.
4,5 months is still a bit fast though. Getting a new employee up to speed takes 6 months in a lot of cases.
But mostly you know it sooner when it wouldn't work out.