Blocked Contact on Iphone

Hello,

Strange problem. I have one contact that is on my iphone 4s that for whatever reason, when she sends me a text, my phone neither vibrates or makes noise when I get it. All other contacts work fine, just this one contact doesn't get through.

Any ideas where I should look to change this? I sync all my contacts through my gmail (exchange) and never had a problem with other phones.

Any suggestions would be great. Thanks.