I cannot give you specific legal advice and I do recommend that you contact a local elder law attorney who is knowledgeble about VA claims. For many clients I work with, an irrevocable trust can be a great method of holding the home. The home is an exempt resource since it was her residence. Depending on your situation, you may want to simply leave it alone until you're ready to sell and then transfer the proceeds from the sale to a trust or make a gift to a family member. The type of trust drafted to only hold real estate would be different from the type of trust drafted to hold money, so if you don't know what you are going to do with it now, it may be better to not do anything until you are sure. Again, the VA's rules state that the residence is an exempt asset, so it should not count against her until she sells and converts it to cash. If it is rented out, there are ways to keep it exempt without using a trust. I would not personally recommend selling the home under an installment because those payments would be income to her and that can disrupt eligibility for VA and Medicaid, which she may need down the road.
I don't know what kind of advisors you have spoken to, but if you haven't spoken with an elder law attorney who knows about VA, I would highly recommend that you do so. To find one near you, check
www.naela.org - National Academy of Elder Law Attorneys
Angela