She has indeed matured as a politician. Other all parties didn't had confidence in them and were hiring nautanki-walas/walis to fool the voters, and banking on other superficial measures.
Mayawati on the other hand was busy winning support of other sections of the society at the grassroot level.
With a wider representation in the party, people of UP will be more comfortable with her policies. And because of the clear majority she can also focus on balanced development, for she has to worry less about other shaky partners.