Thanks for the additional information.
Based on the fact that she is following you, I would sit in the room with her so she does not get up and so you can be on stand by if she needs you. I would let her nest and not pay too much attention, read a book, etc so that you are there but not overly attentive. Because of their head size and shape, some Pekingese labors can be difficult but many have natural births without problem so don't worry just yet. The fact that she is having 4 pups and that the father is smaller are good things. Once you see contractions (forced abdominal movement, she should produce a pup within 30 minutes. If you see that she is not, I would call her vet and have them on standby. After 40 minutes of hard pushing and no pups, I would bring her in- she may need a c-section.
If she has a pup you will have to make sure she begins to clean it. If it is in a sac, it needs to be popped and the fact and mouth cleaned. Some new moms do not know what to do so you may have to help. If she cleans it, make sure it starts to stir and then try to nurse. The next pup should be born within an hour. Again, hard contractions should be no more than 40 minutes. If she does not have contractions and it has been longer than 1 and 1/2 hours from the first pup, she will need to be checked by the vet.
If she continues to have the pups without problems she will likely rest, then want to get up and eat/drink, etc. Make sure she returns to the pups to nurse again.
You can also look for more warning signs of difficult labor and how to links on helping care for pups in the following links: http://www.labbies.com/reproduction3.htm http://www.debbiejensen.com/whelping.htmlhttp://www.debbiejensen.com/whelping.html
Hope this helps. Please let me know if you need additional information.
Best wishes to you both,