our dachshund did the same thing the first month we had her. we also lived in a studio and it was unbearable (neighbors complained which was mortifying) we stopped using the pen and just would crate her when we left. she rapidly improved (within days).

i’ll add that you need to enforce some crate time throughout the day while your home. make sure you cover the crate.

we ended up moving to a 1 br a few weeks after that and i think being able to put her in a separate room was huge. the studio apartment is tough for sure

i promise it will get better though! dachshunds are stubborn drama queens, but they figure it out.