Check if the first word of previous paragraph is the same as the next paragraph.

[macropod]

I suppose for the example she gives that should work. If the names changes as she indicates, then with this case not so well

That could easily-enough accommodated by changing the expression to look for a match of the first two words, for example:
Find = ^13([A-z.]@ [A-z]@>)[!^13]@^13\1

I'm not completely clear on what your expression is actually doing

The updated example looks for a paragraph break ^13 followed by two words ([A-z.]@ [A-z]@>), spans anything else in the paragraph

[!^13]@^13, followed by the same first two words in the following paragraph \1.