Hey!
If she started flowering that small, it's most likely an auto flower.
As the sun hours increase slowly, I don't think she'll stress or herm. Autos can bloom easily with 18 hours of sun.
That's supposing it's an auto ofcourse.. as for yield with that size anywhere from 5-10 grams.. depends how she fattens up in flower.
On another note, that plant your super croping seems to be starting to flower as well, there were a good amount of pistils on the tops.
Hope this helped.
Good luck and happy growing!