My sister has a tendency to do this.
When I need support and help, she can't even be bothered to text me back most of the time but if SHE needs something I get a text, facebook message, and phone call. She's the youngest, so I think a lot of it has to do with my parents always tending to her with a drop of the hat and me doing the same. We've kind of created a monster in that way. She's a good kid and I love her very much, don't get me wrong, sometimes it's just very stressful and I just can't. On those times, I have learned NOT to pick up or respond and to only get back when I feel like it unless it's an emergency. I am usually the first person she calls in those situations but at those times, I respond.
If it's about wedding planning for an engagement that ISN'T happening, I tend not to respond or to respond later. I would say don't pick up. But your husband is also going to have to be on board. My SO's ex-wife calls a lot just to yell obscenities at him or disrupt our evening. She also has a tendency to call the cops when she can't get ahold of us. It's incredibly embarrassing and frustrating for him and because they have kids, he kind of has to vet the calls but he's told her if she can't leave a message or send a text about what it's about and we are in the middle of something, he can't possibly know it's an emergency to call back for.
***proud Hoosier, statistics nerd, and mom to a headstrong toddler***
****one car family and loving it!****
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Le Monstre Vert - 2013 Surly Cross-check
Chessie, Scottish Terrier
Bonzai, Catahoula Leopard Dog