I don't think she's got that, as the symptoms are slightly different. On Wednesday she was walking away from a distance, Tuesday she started eating in her own ( but she stopped that now) and is was trying to get her to eat and drink this morning and she's eating on her own with help, but I doubt she will find the food to eat unless I'm there. She's very thin, and even the vets pointed that out, she was a ex battery hen about 5 years ago so she's quite old. There are no signs in any other chickens or guinea fowls ( flock of 10 all together ) and Mareks is highly contagious
A virus that affects the nerves is pretty much the definition of Marek's. Marek's has several "forms" and some chickens may not ever show any symptoms, or might only show some of the symptoms. If she is blind, she may simply have ocular Marek's. Many people have birds that live with this for years, as it seems to be the least harmful form overall.
I have Marek's in my flock and 8 of my birds have never shown signs, and they are now 3 years old... many chickens never show signs.
If she is blind you will have to observe her carefully and see what you think her quality of life is. Some birds adapt and figure out ways to find food and water, often by listening to what the other chickens are doing. She may need help for a while. It mattes how much time you want to invest in her.
I do hope she recovers, but if not, you might consider getting her formally tested for Marek's (or, whatever the vet thinks the issue is) so that you know for sure, as it will allow you to plan carefully for your other chickens. For more info, see the link in my signature, "The Great Big Marek's FAQ".
Also after some research it says that she should have been vaccinated for Mareks at 1 day old because she was a battery hen
The vaccine does not guarantee immunity. At best, it is 90% affective-- meaning even in the best conditions, 10% of all vaccinated chickens are likely to get the symptoms anyhow. Because of virus mutations, not all vaccines are even 90% affective anymore. It matters what strain you might be dealing with, if it is Marek's.