Hi and welcome to YT
!! It's so hard to say how she will react to any new pet, bc each pet is so individual. I now have 3 yorkies. We first had Wylie...when we brought home Marcel, Wylie became "needy" for a good couple months, so we just helped him and supported him through that time until it passed. When we got our girl, Pfeiffer, both of my other dogs were all "yeah, no biggie" and it was just like she'd been there all along. So, it really depends. I think it can be great to have more than 1 though bc I do think dogs get lonely and may do better w/ another kiddo. That said though, there are tons of people who have just 1 kiddo, and that kiddo is as happy as can be...so I don't think you can really go wrong either way.