re submissive urination:
Dogs don't do this "on purpose", it's an instinctive & uncontrollable response. Puppies are much-more prone to it than adult dogs - however, it's also a heritable susceptibility, & well-known in some breeds [Cocker Spaniels, for instance].
So it's possible
that U have a dog whose sphincter is a little looser when she's stressed or anxious, due to genetics; we'll hope that's not so. If worst comes to worst, she might
need panties with a disposable liner for high-stress situations [visitors, especially very-tall / loud persons, or for some dogs, any strange men].
By 6-MO, most dogs have outgrown the puppy tendency to spring a leak when they feel anxious or scared, unless it's a BIG scare - so either she has a sensitive temp, or U're being too intense when U 'discipline' her.
6-MO is puberty, the rough equivalent of 12 to 14-YO in humans, behaviorally, & most humans outgrow "peeing their pants" under moderate stress by school-age [5 to 6-YO]; most puppies similarly do so, by approx 3 to 4-MO.
I'd also like to know what 'discipline' includes -
it can be many things, & even a hard stare or displays of anger can unnerve some dogs. Collar jerks, dragging her to the scene of her 'crime', etc, are useless when U come home to already-existing damage. It's done; U don't know WHEN it was done - it could have been 15-mins after U walked out the door, & it's an hour or more later when U return - & punishing after the fact only damages her trust.
U can interrupt a dog in the act
of doing something unwanted, by redirecting her / him with a cue for a conflicting behavior, something the dog can't do while also performing the unwanted actions, or with a mild startle [clap hands], etc, & no harm is done; the action is clearly connected to the dog's action ATM, & there's less chance of confusion on the dog's part.
Interruptions are very unlikely to cause fallout, but given her apparently sensitive temp, i'd make them low-key ["Whoops!" or 'uh-oh!' in a cheerful tone might be quite sufficient, for her].
given her breed-mix, overattachment is a common issue, & certainly as above, boredom is a big problem -
"Something to do, & a place to do it"
is a crying need in any dog, & my simple preference would be an airline-approved shipping-crate [which serves as transport kennel & evac unit], plus a stuffed & frozen Kong, or other long-lasting busywork / pacifier.
Put her whole meal in a Kong or 2, freeze it rock-solid overnight [tip down in an empty yogurt container, WITH the lid on, keeps it upright & prevents freezer-burn], & give her one or both Kongs B4 U leave.
I'd put the crate away from the main door, with setback, so if there's foot traffic or a delivery, she won't be upset / will be less upset. Another solid interior door between her & any high-traffic areas, to reduce noise, is also good - if the bedroom is the quietest room, i'd put the crate there; whatever works to make her feel secure & lets her relax.
If U don't have a crate, CraigsList, eBay, PreLoved, gumTree, & other "classified ad" sites are good sources for used airline crates; a used model saves about 1/2 the new retail cost.
A standard 2 x 2 x 3 should fit her fine - they're actually abt 26-W x 27-H x 36-L; she only needs to be able to enter, U-turn, & exit, she won't be standing erect with her head & neck at full extension. // Try on the floor models at any pet supply; if she must BACK out, it's too small; if she can stand & raise her head fully, it's too big.
They last for decades, if not left outside in the sun repeatedly [UV will make the resin brittle], & will keep her safe in the car, plus keep her calmer - if she's the type to whine or bark at passing traffic, flip the crate so the solid bottom is up, & she can travel without seeing the cars, trucks, & dogs out the windows.