I have heard the following dialogue in the German TV series "How to Sell Drugs Online (Fast)":
Boy: Du hast ja noch meine Gehirnzelle.
Girl: Klar. Die war sogar mit in Amerika.
Context: a German young couple has decided to take a break after the girl's return from US. Now, they have met again and are talking about a gift the boy has given to the girl in the past: a stuffed brain cell.
I assume the girl meant "mit mir" in the last sentence of the above dialogue. Is that right? Is omitting the (direct/indirect) object like that usual in spoken German?