One subtle point to note is that the room for Amy to sail her proper course is not one of the types of room listed in the definition Mark-Room.
If the next mark is Mark A, Rule 18.2(c)(2) is of no help to Amy because at Position 3, Rule 18.2(d) switches off Rule 18.2(c)(2). So at Position 3, Amy would not be exonerated under Rule 21(a) if she jibed and, in so doing, broke Rule 10. If the next mark is Mark B, Rule 18.2(c)(2) is once again of no help to Amy because, as noted above, she is already protected by Rule 21(a) when she jibes, because her jibe is necessary to sail the course to Mark B. (Rule 18.2(c)(2) does sometimes play an important role, but not in these situations at the windward mark.