Between chapters 28 and 33, particularly within 32 and 33, Fanny is faced with some hard decisions, and is in some cases driven to emotional distress because she is unable to tell the truth.
After being rejected by Fanny once already, the much admired Henry persistently proposes to Fanny. After Henry visits Sir Thomas and explains his situation, Sir Thomas goes to Fanny and speaks with her. Sir Thomas feels that Henry is the right person for Fanny; little does he know about Henry playing around with Sir Thomas's daughters (Fanny's cousins). Fanny is thus put in an incredibly awkward position, Emotionally, Fanny is blackmailed due to the fact that she revealed no reason for turning down Henry's proposal and is being solicited by Sir Thomas for it, and is unable to tell the truth to Sir Thomas because it would hurt him and it is immoral for her to do such a thing.
Fanny is further blackmailed due to her rejection, as the next day, when Henry comes to propose yet another time, Sir Thomas explains to Fanny that he will inform Mrs. Norris, a member of the family who is quite cruel to Fanny. As expected, Mrs. Norris responds in an angered manner. .
In addition, if Fanny were to accept the proposal, she would "officially" be a member of the family, and will no longer be looked down on for being taken in. .
Fanny, most likely, has more to come, as many (including Sir Thomas) believe that Fanny may have rejected Henry because she is in love with Edmund. Mary, who encouraged Henry to propose and was quite sure that Fanny would accept, may believe that Fanny wants Edmund as well, which may lead to another feud. .