You modern young ladies are splendid: perfectly splendid!
The way that Praed patronizes Vivie in his praise of her unconventionality seems condescending here. He patronizingly refers to her as a "modern young lady," and Vivie is unamused by him as he discusses the differences between women from his age and "modern women." Vive is described with much more of a masculine tone thus far in the text, as she appears confident and business-like, and greets Praed with a strong handshake. These descriptions of her coupled with her higher education in math suggest that Vivie's "unconventional" and "modern" aspects are derived from her overt masculinity that counters the rigid gender expectations of the 19th century.