Advice desperately needed, before I go cetifiably insane

Hi all! I just got a new 4yr old Thoroughbred mare, never been raced. She came 3 weeks ago from Oregon to Las Vegas. It's been a crazy 3 weeks for the both of us. I really need your help please!

Her 15 hour trailer ride here was stressful, when we got her to the new barn in Vegas she seemed ok. They fed alfalfa cubes only (which she hated) and one day a ranch hand was leading her out and she freaked out, reared and fell 3 times on concrete scraping her legs and hocks. Vet was called--she was ok just cut up. Then a few days later all of the horses at this stable get a horrible cough and cold---so she gets it too! Stops eating and her pastern was swollen from fall. So I decide to leave this stable and move to another facility.
She still has a cold so I call vet and he gives her the appropriate meds.
She has gotten much better, swelling gone, eating and acting happy.

My poor girl has been through so much and I need advice on how to feed her.
She was out on 100 acres of wet Oregon pasture (which gave her vertical cracks in her front hooves and rain rot) and was fed sweet feed in the pm.

At the barn they feed alfalfa 3 times a day. I had started her on Omelene 400 (pm only)and biotin for hooves. She will be ridden 5 days a week, she is greenbroke and I'd like to do humters in a year or so depending on her progress.
Can anyone recommend a good grain to keep her on? Is the Omelene 400 ok? She is a healthy weight currently. Thanks so much!

I realy like omelen as long as you get the right feed for the amount of work your horse dose. If she was on grass I would recomend you trying to purchase some nont alfa hay for the beging and slowly add alfa. It has lots of proten and will fill her with energy.

What other options does the barn offer concentrate wise or are you providing it and what brands are available? The 400 is not the right feed in this situation. It's designed as almost a forage replacement for horses with heaves, allergies, high workload... The nutrients are "diluted" with fermentable fibers so you have to feed a higher amount to get the desired nutrients. Going from pasture to straight alfalfa was a rather dramatic change but it's done at this point. She will have most of her needs met with just the hay and your concentrate product will fill the holes.

For now, go with the hay. Give her 3-4 weeks. Is she loosing/gaining weight? Is she loosing/gaining condition? At 4 she is still growing and filling out so I would add a low protein (no more than 12%) concentrate to provide extra Vit A (will help clear up the rainrot) as well as other vit/minerals that might be lacking or low in your hay. A ration balancer might be appropriate if the hay alone keeps her at a desirable weight.

As far as her getting sick after she arrived, she most likely was the cause of the outbreak with the other horses. It's not uncommon for horses under the stress of trailering to develop upper respiratory illnesses soon (4 to 14 days) after arriving at a new facility. If it's your garden variety shipping fever, it will not respond to antibiotics and just needs to run it's course (2 to 4 weeks).

Does your horse NEED that much alfalfa? As someone said, that's an awful lot of protein..

As for grain, we use purina Strategy. Some people love it, some don't....they say it makes their horses "hot". We have used it for a year and our boy isn't one bit "hot", so I guess it depends on the horse.

As for alfalfa, our OTTB only gets one lb. Of shredded(he tends to choke) alfalfa cubes once a day...and leaves half of them in his feed bucket. He doesn't seem to have a taste for alfalfa....