The evening zoomies are entirely normal - almost all puppies/young dogs find themselves suddenly more awake around evening time as they are naturally crepuscular (i.e. dogs normal time to be awake and active is dawn and dusk). For puppies this often means the behaviour degrades a bit and the mouthing etc starts. However, obviously for you guys the extreme zoomies your beagle is displaying is way too much.
I think I might:
a) look at her food; just like with children, what dogs eat can make a massive difference to their behaviour. What do you feed her and when?
b) change one of the walk times to coincide with the evening burst of energy - not forever but for a few weeks/months yet. Eventually you can bring them forward into the day again but for now she needs to be doing something other than going bonkers, otherwise it risks being a habit.
c) once back home after a walk set a very reliable routine to indicate it is time to calm down: perhaps a kong when you get back, followed by a trip into the garden then into the lounge.
d) keep putting her out the room if her behaviour goes above a threshold; it might not work in the moment but over consistent attempts she should learn.
e) as part of her routine never play with her in the lounge and keep that room for relaxing (for her) only. Playtime in the kitchen or garden but never in the lounge so she is never mistaken about thinking she is in there to play.
I'd also be tempted to talk to the shelter you got her from to see what she was like while with them and whether or not they have a behaviourist that could support you in settling her in.
9 days is not very long for her to learn a new way of life and it might take a while yet so she'll need patience (though I appreciate that 9 days can feel like forever when it's not very pleasant for you).
Attaching a cue to her being sleepy can help a bit too. When I first got my pup I would say "settle down" repeatedly as he fell asleep in a soothing voice. After a week or so of doing that I noticed that I could use "settle down" as a command for the times when he is not sure whether to sleep or play. More often than not it convinced him to just relax.
p.s. your DH is wrong about rewarding the good doesn't mean anything, but then you already know that :)