Given the location, a partial denture would be okay, and look much better than the gap. The metal is at the gum-line and won’t really show.
I’ve partials, bridges and implants. Implants are best, but they are pricey.
Bridges were the best option prior to implants, but were it me, I would go with the partial over the bridge, until I could afford the implant.
She should get a partial, see an orthodontist, and once her teeth are all in place, get the implant.