Now her left leg is bothering her...

This morning Bri's left leg seemed to hurt her. When I was taking her pajamas off and bending her left leg she kindof hit my arm as to say stop that hurts, and she just grunted at me. She couldn't even stand up today which is making me wonder...does she have this in her left knee now too? She is very sensitive and does not want me to put her down during the day today at all. So I have just been carrying her around with me, and when I go to set her down she just collapses onto the floor. Tonight was even worse! She isn't even walking at all now!! She is limping on both legs and when you put her down onto the ground if you walk away from her she cries of course but if you don't immediately get to her she is just crawling or scooting across the floor to get to you!! Oh my gosh! What is going on with her poor knees?? I went to Hi-Health and got her vitamin C, vitamin D, and I got her a rub for bumps 'n bruises by Hyland's it's a homeopathic rub to relieve symptoms of bruising and swelling. My mom has told me about the vitamins to give to her because her immune system is obviously effected and we need to keep her healthy! No flu shots here!!