Try not to feel judged - I don't think anyone here is making a judgement about you as a person - if they are, it would be unfair to do so, considering we don't really know you. It seems as most of the people here are just trying to better understand your motives for wanting to *convice* your friend that she has been mistyped before they analyze your main concern - whether your friend is indeed an INTP or not. Much of that, I think, comes from the issues and problems we have dealt with in our own lives when being too brutally honest with others and/or involving ourselves too much in a friend's life. I know in my own case, being too involved, however well intentioned, has cost me at least one good friendship. This is especially an issue if your friend is really a Feeler. I think a lot of it also comes from our need to understand the "big picture" before we focus in on a more detailed issue (especially since most posts have come from N personality types.)
So the following points are made purely from an intellectual curiosity standpoint and not a moral one (since you'll have to deal with the moral issue of whether to convince your friend of her type, the consequences of your choice either way and, more importantly, since you are asking us for advice about her type and not what decision you should make with the information.)
1) I consider the fact that she has chosen pharmacy as her major mostly irrelevant, especially since you think she may have outside motives for doing so. The reason is that, especially if this is her first career choice, people often choose careers that do not fit their personality type well. Or she may like the classes for the intellectual component, but find out when she enters the job force that she doesn't really like the career at all.
2) I think it would be much easier, instead of trying to guess her MBTI type, to start with finding the temperament that best describes her. (NF, NT, SP, SJ). At her worst, is she.... boring and inflexible? Impulsive and irresponsible? Overly emotional and moody? Arrogant and off to herself? What about her best qualities? What attracts you to her as a friend? Is she dependable? Fun? Understanding? Confident and witty? If you could provide some more details about her personality, other than her academic/career interests, it would help greatly. You've said she's imitative - it's a start but we need more information.
3) What does she like to talk about, outside of her pharmacy program? Does she tend to talk a lot about other people and her relationships with them? Or does she talk mostly about ideas, thoughts, etc.? Does she talk more about future possibilities or does she have trouble seeing beyond today?
Provide as much info you can - otherwise we're taking a stab in the dark here