Best way to add weight to a 4 year old tb?

Here is Pammy Sue...

And here's one I just found of her from summer..that's her owner..he's not very horse savy..it's a learning process. One thing I can assure you is she will NOT look like that this year..not as long as he keeps her and I'm able to work with her. Too skinny for my taste..I know she's a tb but still..and undermuscled in my opinion..but almost every horses is indermuscled compared to my chunk tank paint I'm used to..even so..agreed? She's a little thin and needs muscle?

Oh absolutely! Would like to see 200+ lbs on her yet! Good job helping this guy and taking charge of her feed, are you leasing her?

Good I'm glad I'm not alone. I'm not exactly leasing her.. I seem to be the one who takes in the sale horses that nobody else cares about taking care of. I move them into a stall near my gelding and take on their stall and daily care/riding. I was taking care of a 2 year old and kind of rudely was bought from under me while I was on vacation. So the stables manager called and told me to work with this one.
She's owned, last I heard he was selling her for 150 but I think he got attatched and doesnt really know the value of a horse. She's super gentle with no vices. I wish I could afford two horses board, I'd buy her. So basically, he pays bills and I ride/manage feed and care. He rides some but he doesnt really know what he's doing..orow he's we're going to ride together...we'll see how much he knows...he bought the horse to ride with his girlfriend. She was teaching him to ride and then they broke up so he's kind of stuck with a horse and doesnt know what to do but he deffinetely loves her. I'm hoping to get some feed in her and some miles on her so she's a little more beginner ready..
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I too have a thoroughbred mare. She is nine though. I have problems keeping wait on her still. I feed her grain and molasses. I also feed her senior feed. Just a full scoop of grain with a cup of corn oil always helps. Im also going to be putting her on the new race horse feed that just came out

We are putting her on gro n win and beet pulp as well as buying extra hay.
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She is pretty average for her age. I don't thinkk she's to bad. My mare puts on so much wait during the winter here

Oh no, these are just flattering pictures.. believe me. The bottom one is from summer when she was more near her proper weight. She's so furry you can't see it..she has seriously no topline and is so hollow chested. Her thigh area..straight bone. She's transitioning onto gro n win and beet pulp now and gets 2 flakes am and 6 flakes pm so we're hoping she gains quickly. She's pretty bad. My farrier(who does her feet as well) said to me that I'm the saving factor in her life..she's THAT bad. It makes all this worth it though that's for sure.
I'm hoping with all the changes she gains in no time. She now is turned out during the day and inside at night and has a midweight blanket 24/7 plus the change in feed. I'm hopeful!
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Oh no, these are just flattering pictures.. believe me. The bottom one is from summer when she was more near her proper weight. She's so furry you can't see it..she has seriously no topline and is so hollow chested. Her thigh area..straight bone. She's transitioning onto gro n win and beet pulp now and gets 2 flakes am and 6 flakes pm so we're hoping she gains quickly. She's pretty bad. My farrier(who does her feet as well) said to me that I'm the saving factor in her life..she's THAT bad. It makes all this worth it though that's for sure.
I'm hoping with all the changes she gains in no time. She now is turned out during the day and inside at night and has a midweight blanket 24/7 plus the change in feed. I'm hopeful!
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