Hi there. Thank you for using PetCoach. I'm sorry to hear that Cocoa is having this issue. She sure is adorable!
Unfortunately, we cannot recommend that you give any over the counter medications to Cocoa. We are not allowed to do that by law since we haven't examined her in-person. Dogs are actually very sensitive to over the counter medications and if she has any conditions underlying (like kidney disease for example) those medications can make it worse.
I suggest you get her to your vet for an exam. It is not common for small breed dogs to have hip problems so it would be best to get her examined to figure out what is causing the problem. Then you can discuss the options for treatment with your vet.
In the meantime all I can recommend is that you use a natural joint supplement like the Missing Link Plus but you are not likely to see an immediate effect.
http://www.allivet.com/p-1647-missing-link-vet-canine-plus.aspxHope this helps. Best wishes!