First, most flows have at least slowed down. Factor in that we are well past the summer solstice, and most hives will go into frugal mode, and would rather fill existing comb, than waste resources drawing comb when they really don't need too.
For the record, if you place a box below and one above an existing brood chamber, bees will almost always draw above where trapped heat helps in the process.
If you place wax foundation, the bees may chew it out at this time of the year. With plastic, they will stop at some time, and can pick back up at a later time, with no damage to the foundation.
As for balling the queen......most times you find this happening, you should just close it back up. Bees ball queens for several reasons, including protecting her from robbers and other bees inside the hive, as seen with combining, etc. If the bees wanted her dead, they could kill her within seconds. Beekeepers should never try to "rescue" her by prying off bees, etc. I have found that about 90% of the times I find a balled queen, the queen is healthy and laying eggs a week later.