10 hours a day alone is a bit long for a puppy.
i always thought pekinese are great apartment dogs though, not too active, dont need a lot of exercise.
i got a maltese and live in an apartment right now and he does fine. he adjusted nicely to the times when i can play with him and times when i dont got time he just takes a nap now.
and even though i could be with him all day for the first months i know how overwhelming it can be!
being responsable for such a little creature, getting them potty trained, trained in generell.... the first year really is a challange and specially the first month IMO.
dont feel bad for being overwhelmed. at least you try to do the best for the little one.
in case you decide to keep the puppy you might wanna try the wizdog instead of puppy pads, its impossible to shred that
http://www.wizdog.com/index.php
maybe you can take 2 weeks off for the begining too? that would already help a lot to get her pad trained and bond to you.
i know a dogwalker can be expensive but maybe you could place an add. i bet highschool students would love to make a bit extra money, playing with a puppy for an hour everyday, its for sure cheaper then a professionell......
if you really think you cant provide her what she needs then the earlier she gets into a new home the better. she is still so young and wont have any problems adjusting to a new home.