My baby cut 4 teeth at age 3 months. Sounds like your little one is facing a lot at 7 months. She is teething and possible experiencing a world so facinating she can not concentrate on eating. This is also known as a hunger strike. This is NORMAL, and when she gets hungry enough or adjusted to her new world, she will settle back in. It is harder on you than on her in many ways.
Be patient, keep loving her and enjoy her enjoying her new world. She is also getting ready for other foods to be introduced. You did not indicate if she has started solids yet, but she sounds ready to me. The most important thing is to use your God-given instincts and listen to your heart.
Also, your milk supply will adjust both down and up when she returns to more nursing, if she does. My daughter nursed for 4 years along with eating everything under the sun. She had pneumonia 4 or 5 times and needed the nursing for fluids and comfort. I took a lot of good natured ribbing about her still nursing, but she eventually stopped on her own. She was the most healthy kid ever during childhood, so I guess that was good.
Enjoy your baby, These are cherished moments, and the both of you will do just fine if you relax and let her call the shots for right now. She will not starve herself. Good luck....