I'm Doug, and I am very sorry for your loss. My goal is to provide you with excellent service today.
First of all, because a remarried ex-spouse is not eligible to make a survivor claim on an ex-husband, your husbands ex will not qualify to make such a claim as long as she remains married.
More importantly to you though, when an ex-spouse makes a survivor claim based on her ex-husband's earnings record, it has absolutely no effect whatsoever on the widow's right to make a full survivor claim as well. The claims are deemed entirely separate and have no effect on the other.
So as you are collecting a survivor benefit based on your husband's passing, you needn't have any concern about his ex filing a similar claim. She cannot do that at the moment and even if she will be able to in the future based on the ending of her marriage, her claim won't impact your claim at all----you will continue to collect the same benefit, without interruption.
You may reply back to me using the Reply link and I will be happy to continue to assist you until I am able to address your concerns, to your satisfaction.
I hope that I have been able to fully answer your question. As I am not an employee of JustAnswer, please be so kind as to rate my service to you. That is the only way I am compensated for assisting you. Thank you in advance.
I wish you and yours the best in 2016,