There are a number of stock type pieces that can be assempled into new pieces. This might be nice for a student to get an approximate look of what they're trying to achieve. Poser also allows you to quickly change a texture on a piece of clothing. The figures pose fairly easily and some nice images can be done. You're best bet would be to show your sister Poser in action. Ask around (or just start a new thread here) to find a Poser user in your area and ask if they'd do a demo for your sister and yourself. She might really like it, or may decide that the time it takes to get something out of it isn't worth it. You really need to see it in action to make a final decision.