You can train them but it's much tougher while she's so young. She may poop multiple times per day. As they get older they poop less frequently and it's easier to train them. You can try it now but may not have much success yet. If you take her out and give her a warm
bath at around the same time every day she will start getting used to pooping in the
bath. After a while of that you can take her out and put her in a space that's easy to clean like a linoleum floor. Keep her there (within reason) until she goes. Eventually she should learn that's the place to go and just do her thing. Having this happen at around the same time is more effective. They seem to respond to routine and they don't tend to like pooping in their enclosures. This worked with my guys but different people may have different results.