A plant that size with the right care and support will absoutely be worth your while to continue through to harvest. Remove all the dead and dying maerial at the bottom - its just nesting space for more mites! She does look like she could do with some more feed too. Out of interest, how did you deal with the mites? Keep an eye on the rest of the plants too, as those fkers spread like crazy. Honestly, I would go all in and see what you can make of this plant. Keep us posted too - as this has potential