Because of the internet, copyrights are automatic once it appears somewhere. You no longer have to file a copyright, you only have to prove that you had your (content) first.
Trademarks are a way of saying, "use this and get fuc%ed, we're going to sue you." That little "tm" is just a "sue happy" reminder.
The 1st move anyone makes is to "send a letter." Letters don't mean shit. I get one everyday, it gives me an opportunity to legally harass an attorney. Btw, copyright attorneys are big bucks and most attorneys aren't one, but will send the letter anything so you say "oh shit, I got a letter from her attorney."
Does she have a case, i.e. did your friend "steal" her idea/product/content? Aside from intent, does is it the same?
Lawsuits suck and no body wins but the attorneys. The second thing to remember is that lawsuits take time and money (a lot of both) making them only worth it is there's really something to go after. Real lawsuits, copyright stuff, won't every be on the People Court, unless they did a People's Court-Wheel-of-Fortune special. If your friend doesn't have money they may be going after the product. Consider all of this before you get an attorney. If they going after the product and it's worth keeping (to your friend), only then get an attorney.
Until then, make paper airplanes with their letters. Better yet, make me a s'more.
And there are ways moving forward to completely keep her product away from her marketing, operations, etc. That way they have to find the product before they can try to sue or it. Also, other marketers concerned about legal issues, use multiple LLCs and managing Delaware LLC to remain 100% anon, even in court; only criminal issues/tax issues would breach that wall.
Later.
Cam