L.G.
J.,
Babies develop is so many more ways than we can visually see. You can be assured that she is growing, changing and developing in some way. Also, at 6 months, your baby has not mastered object permanence. When something is out of her sight, she has no comprehension that it will ever return. So, when she wakes frightened or in pain, she can't understand that you are in the other room. She NEEDS you and to meet this need, she has to see, feel, smell you. If putting her in your bed is working for your family, that is great. Once she has the understanding of object permanence you will be able to get her back into her bed for the night.
If putting her in your bed is not working for your family, you could try snuggling her back down with one of your night shirts or some other object that smells like you. Especially if she is not waking completely...
Once the teething or other developmental issue is resolved, she may return to her "normal" sleep patterns - or she may not. But by about 9 months she will understand that when she can not see you it does not mean you have disappeared forever and separation issues will be easier on everyone.
I can also assure you that your 6 month old is not interested in nor able to formulate a plan to manipulate you. She only knows that when things are not right with her that YOU make them all better - and what a wonderful thing for her to know. :) At this age, needs are needs - not manipulations. Listen to your baby and your mother's heart and you will raise a bright, independent child who knows that she can count on you to meet those needs. Don't worry about manipulation until she hits the terrible toddler phase ;)
L. G