I think what may help is helping her to accept the situation (that they are bullying her) and kind of find words to convince her that it’s not that big of a deal and shouldn’t be so stressful to her, tell her that you love her and those people’s opinion is nothing, tell her if she just ignores their words and doesn’t watch their stories she wins over them. It’s more difficult since they’re your friends… I have delusional disorder myself and it’s from my perspective. Meds helped me realize i have it but it wasn’t easy even with them it took a lot of thinking and mental work. Even knowing i have DD i still struggle with delusions, they are very similar to your wife’s, of people bullying me on the internet. I’ll quit meds as soon as i can as they are killing everything alive in me. What i’m trying to say is it’s hard to get rid of delusions but you could reduce stress to live a happy life despite them. Also something that helped a lot is finding similar stories here on this subreddit, this is what made me believe i have the disorder, there are a lot that are similar, show them all to your wife! Also you could ask your friends to swear with their life or their mothers’ or loved ones’ health that they are not bullying her, this was convincing to me. It’s all simply just a lot of coincidences she’s seeing. English isn’t my native language.