Welcome! I've only had this problem once; and it was a dog I'd adopted out to someone in an apartment. She was quiet at our house but apartment life was different so she started barking any time she was alone.
Then she told me she bought a Sonic Egg from PetCo and it helped immediately lol. It's this little ultra-sensitive device that you place in the room where the dog is. It senses barking and emits a high frequency tone to interrupt the dog. Dogs don't like the sound, so they learn quick that it's barking that triggers it. But I've heard reviews that it was REALLY sensitive (as in, went off when someone sneezed) so my advice would be to just turn it off when you're home; so you don't set it off accidentally but still make sure that you do correct her when she barks; as it'll confuse her if sometimes she's allowed to; and sometimes gets a beep. Consistency is key; and I've heard those sonic things have worked great on some stubborn dogs when their owners couldn't be home to correct them.
Then she told me she bought a Sonic Egg from PetCo and it helped immediately lol. It's this little ultra-sensitive device that you place in the room where the dog is. It senses barking and emits a high frequency tone to interrupt the dog. Dogs don't like the sound, so they learn quick that it's barking that triggers it. But I've heard reviews that it was REALLY sensitive (as in, went off when someone sneezed) so my advice would be to just turn it off when you're home; so you don't set it off accidentally but still make sure that you do correct her when she barks; as it'll confuse her if sometimes she's allowed to; and sometimes gets a beep. Consistency is key; and I've heard those sonic things have worked great on some stubborn dogs when their owners couldn't be home to correct them.