She moved to the University of Wrocław to continue her studies, and completed her doctoral thesis that described 44 new species of the genus Heliophanus.

Her research has focused on the description, taxonomy and zoogeography of jumping spiders, and has included extensive work on African genera like Menemerus and Pachyballus.

She achieved her MSc in Biology for her work Obserwacje ptaków wodno-błotnych zbiornika zaporowego na Wiśle pod Włocławkiem w okresie wędrówek ("Observations of Wetland Birds on a Dam Reservoir on the Vistula River in Wloclawek during Migration"), which was published in Acta Zoologica Cracoviensia in 1973.

[2] After graduating, Wesołowska started work at what is now the University of Natural Sciences and Humanities (then Wyższa Szkoła Pedagogiczno-Rolnicza) in Siedlce, where she met Jerzy Prószyński.

She stayed at Siedlce from 1973 until moving to the University of Wroclaw in 1978 to start her doctoral studies and published her first paper on jumping spiders in 1981.

[8] Wesołowska initially focused on the study of spiders in the Palearctic realm, in both Europe and Asia, and undertook pioneering research on the species in the Middle East between 2002 and 2020.

They celebrated their 40th wedding anniversary with joint publication the ecology of the flatworm Leucochloridium and its effect on the behaviour of the snail Succinea putris.

The couple's academic interest have also been passed to their daughter Olga, who is a member of staff at the Department of Biophysics and Neurobiology at the Wrocław Medical University.