Thank you so much for your response. I had called her doctor that day and was advised by the Dr. that if she did not pass a BM by morning to bring her in...that same evening she had a BM when I got home from work. She is eating regularly again and going at least once a day or twice. I appreciate your response considerably. I have introduced the pumpkin into her diet once a day. I don't want her to wind up with diarrhea. She is actually not moving along with going into heat but I'm in no rush.
I would strongly recommend getting her to a veterinarian. 2 days without making a poo for such a small dog is a really long time...actually concerning long time. Especially since her norm is 3 times a day. I'm assuming she is still urinating right? If she isn't, she needs to go to the vet ASAP. You mentioned lower appetite. This also is concerning, especially if it started after you noticed she's not making poos. Generally appetite is not affected by a heat cycle. Is there any vomiting??
With the possibility of a foreign body (you stated she does eat the stuffing of her toys and hair) and these symptoms a vet visit soon is warranted. If its a foreign body obstruction, this can turn deadly quickly, especially with such a small dog.
As for the pumpkin, it can act as a laxative...however, it ALSO can firm up stool. It does both depending on the condition of the stool in the intestines. If its constipation, it may help, but it might not either. If its a foreign body obstruction it won't work at all. As for the tea, senna is safe as it is not a listed toxic herb to animals. HOWEVER, I wouldn't recommend giving it and the pumpkin. If the problem is constipation it could potentially cause a drastic 180 with extreme diarrhea. With a tiny dog, severe diarrhea can dehydrate them quickly and make electrolytes severely imbalance causing a cascade of serious problems.
Good luck and hope your baby it ok. Keep us updated.