Is there any specific term to describe a person who is a follower inherently because of his/her weak personality and in any discussion, debate or disagreement tries to find a leader or a majority to follow against someone with a different idea?

For example, one of my Persian friends via email described his friend using these words:

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> She doesn't follow her own rules and doesn't have any special idea about different matters even her own field study but tries to follow the majority or a leader even if that majority or the leader are wrong according to ideas of just experts who are not in the group and have no benefit to take one side and leave alone the opposite side. She wants to take advantages by this and becomes a popular face of the year in the community because unfortunately no body seems like her even after one year hard attempts in protecting the community! Such a pity!
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We have sort of appropriate Persian terms equal to this description, but I couldn't find the best term in English for it. Could you please give me your best suggestions?