Just watch the tetras and make sure they don't pick on her. The danios are pretty fast at feeding time so see if she gets enough to eat. Otherwise I don't see a problem with it.
The pleco won't hurt her either.
Yes!! Another person who has figured out what bowls really are! ( > > >DIE, STUPID BOWLS!!!!! > >)
Watch the Serpaes as they tend to be fin-nippers, but then again females tend to be a lot faster and shorter-finned than the males, so you shouldn't have a problem. Make sure you have some floating plants for her to hide in. If you don't want real ones, secure a fake plant to the side of the tank at the top.