I hope I'm posting in the right column. I took my older dog grooming and for the first time I left my yorkie home alone for 15-20min. She seemed fine, but then me and JiJa(yorkie) went to a pet store and on our way she was drooling really bad. I always take her for rides and she loves car rides so that confused me. Inside the pet store she started shivering I though she might be a little cold so I bought a blankie to warm her up. She was still shivering and then I got a call to pick up my other girl.
We then headed out to a doggy party which JiJi (maltese) loves. When I saw JiJa stop shivering I put her down to socialize and she did roam and was smelling buts and everything so I though ok cool. As soon as we got home she threw up her breakfast. From the drooling to the shivering and then the throw up I don't know what to think. Did she miss her older sis or she doesn't like car rides anymore

. Maybe it was allot in one day. How do I start introducing her to the outside world? I know she doesn't mind when pets/humans come over (she actually loves it).
Just a little worried.