By Jennifer Sieg When life gives you lemons, you make lemonade. Even if the process gets a little sticky. At least, that’s what Riannon Palmer had to do after facing a PR agency’s worst nightmare — an out-of-the-blue trademark infringement case — just six months into running her own. Amid all the other challenges of starting up a new business, Palmer says she found herself in the middle of a trademark infringement case when a larger brand claimed too much similarity in the name, a name which she does not wish to disclose. Nearly three years later, the 27-year-old founder of the ‘feel-good’ med…