An ugly slave will need neoplasty before they'll accept it and that's 250. I want you to look at this one i was given and tell me, honestly, that this is workable. Day 1 almost all of the prepayment is gone and it's not getting much better from there.
Yes, that is workable. Her beauty is B+, so even with Bony physique she is able to qualify for up to C+ rating. You have time to fix her physique so she could even qualify for B+ without neoplasty.
With appropriate clothing and mood, even if it was 54 lessons (it'll always be less due to linked skills), you can do at least 5 lessons per day, especially with help of drugs, so not much more than a decade once she's obedient enough. She will get a lot of merit from those lessons which will help raise her devotion so she will qualify for a higher rating, which gives a quality bonus when the contract is completed.
Getting her obedient shouldn't take more than 3 decades. You have enough sparks without sending her to arena to survive that long even if you went with the minimum 200$ start. When you're almost out of starting sparks, you can take a 500$ loan for another 30 days.
60+ days with 760$+ sparks is plenty of time to train a concubine.
Yes, her endurance is an issue, but you can give her supplements and nutritionist (5$/day cost vs. 10$/day speed bonus) to fix that as quickly as possible. Add tutor/school athletics once she is able.
A+ willpower is a challenge for raising her taming but you can compensate with collar + crown of thorns + nipple chain, or pony gear.
S+ intellect will help her learn common skills and build awareness faster.
B+ temperament will help her learn sex skills faster.
Her pride will not be a problem by the time she is ready for intimate training.