Think of 5 things that you like about your work or projects, or are excited about getting a chance to do in future. Plan these topics and what you would say about them. When you don't know what to say, talk about these positive things.
Do not bring up co-worker, yourself. If asked, plan a mild but truthful, and very short sentence about the core complaint, then ask questions back like "why are you asking?" or "What is the norm at this company about teamwork, is this usual" and / or switch the conversation back to things you do like about your work and your team.
If co-worker is mentioned and you are specifically asked, you can say, "I have had some challenges too, but this week this [small positive thing with co worker] happened, and given that it is for project X and I am very much looking forward to doing the [insert thing that you get to do], I hope that the team will only get better from here."
The challenge is that you are very new to the organization, for all you know the other manager wants you to switch to her team, discuss joining the bowling league, (sell Amway?), or even that the problem team mate is her niece and she knows she is bad but will protect her at all costs. Unfortunately, you can't say anything too negative because you don't know your audience. Any negative (e.g., "She's very quiet and hard to get responses out of that I need to complete my work") needs to be balanced with a positive ("but she seems to get along with the admin staff very well"*, "very adept with social media"**, etc)."
*this is code for "this person does not get the work done, but chats with the admin staff all the time instead.
** This is code for "this person is on snapchat, facebook and ebay all day".
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One other caution-- be prepared with an answer if you are asked to "mentor" or "train" the problem employee, as you are too new to the org. to be a mentor, and if you don't click personally with the employee, training them on a job that they have already had for a while could be a nightmare. I don't think this is what the meeting is about, but practice a "no" sentence that makes you sound like a reasonable person. "Let me think on that for a day" is your safety valve, here when you don't now what to say, then ask the manager a question -- "what is the core issue?" etc..
Good luck, let us know how it goes.