No, and no. She still will not sit down and answer LE's questions alone (or with her atty present). LE cannot compel her to answer any questions. Even if arrested, a person cannot be forced to talk. The 5th amendment and all that jazz. No one can be forced to incriminate themselves. Now if you have nothing to hide, and no reason to fear incriminating yourself, and really truly want your daughter found, then I see no reason not to do anything LE asks of you. On the other hand, if you do have something to hide, the law protects you.
It's not just the T-shirts. All posters that said "Missing" were taken down and replaced with "Kidnapped" posters. My question is why would you care what they said as long as her face was out there for the public to see? Wouldn't being kidnapped make her missing as well? "Missing" "Kidnapped" to quote the infamous words of HRC "What difference does it make?" Why replace them unless you're desperately trying to CYA?
IMO DB has spent far more time trying to make sure no one suspects her, and worrying far more about her own reputation than she has actually trying to find her daughter. OTOH, if I knew where my daughter was, and what happened to her, there would be no need for me to go looking.