How can we fill out paperwork if Mom can't sign?

I've also found it terribly frustrating that a legally obtained POA wasn't valid for government forms. Pam has as good an answer for you as any I can give you. Often, a notary can help. Otherwise, go to you local veterans representative and ask for assistance.
Good luck,
Carol

Pam does have a good answer as Carol pointed out, and the situation is terribly frustrating. However, Pam isn't necessarily correct that there is no point -- you'll be the better judge of that. If your dad died of a disease or condition that came from his military service or can be traced back to that time period by his doctors -- he was applying for VA disability when he died -- your mom could be eligible for Dependents Indemnity Compensation which is more than $1,000 per month right now - although if your dad was retired from the military and provided the Spousal Benefit Plan, that money could be offset by a dollar for dollar reduction of her monthly SBP which only provides a tax break or small increase. Even with that, there is legislation in Congress to remove this "penalty." This is different than a VA Pension, which helps low income war-time veterans and their spouses. DIC is compensation for having lost a spouse due to those disabling illnesses and conditions that came from service. Contacting a Veterans Service Organization like VFW, AMVETS, American Legion, etc is a good idea, especially if your dad was a particular member of one of those. You might also consult with a VA disability attorney. Failing that option, you might want to contact your Congressman's or Senator's office.

All that said, an extra $1,000 per month might be the difference between in getting better care for your mom in many ways.

I'm with Reverseroles. I am not sure if it must be notarized for the VA. They just asked me to put my mother on the phone. How do they know it's your mother? I say help her sign.If that is all they require, give the devil his due, or give them what they want. When we try to be so orthodox and abide by all the rules, we are often frustrated.

Tough situation. As a Notary, all I need is a scribble or X on the paper, but I have to be sure she knows what she is signing.
If Dad is passed away, there is no point in pursuing his disability, but you could pursue a widow's pension if she is low income and few assets. Local veteran's organizations can help you.

Dpoa is not recognized thru va.
Hold mons hand and make an x.
I am 100% sure of this.

It might be time to go for guardianship. Especially if there will be many documents to be signed that she does not understand. Are you an authorized signer on any of her financial documents, checks etc? If not take your POA to the bank and start that process also.

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This site has a Dental guide to dentures. It's a UK site but has a great guide to many aspects of dentures. Check it out.

Explain its money to help her and help her sign an x.
Otherwise its a visit from the va and a long process to become her advocate in their eyes.

My FIL was a vet. I told the clerk at VA he couldn't sign. She said take the papers out. Bring them back in signed. He died before we could do that. MIL died one month later. So we didn't pursue. We were also told POA not accepted.

Reverseroles: You're correct.