Absolutely! There are several orders that are nurses and Sisters. They are considered active/contemplative, not cloistered. The one thing that is important to know for a vocation search is what spirituality you are attracted to. There are MANY habited nursing Sisters. Off the top of my head, I know of my future Sisters (God-willing). The Carmelite Sisters of the Divine Heart of Jesus in Milwaukee, WI.
They pay for their Sisters to go to nursing school if they don’t already have degrees. They work in their homes for the elderly (NOT nursing homes).
There are also the Little Sisters of the Poor at littlesistersofthepoor.org/
You might want to browse through these orders from the Institute of Religious Life:
[=%221%22"]Woman’s Vocations in Nursing]("http://db.religiouslife.com/reg_life/irl.nsf/as/?SearchView&Query=[health)
Please let me know if I can be of anymore assistance. May God bless you! I hope that you have a spiritual director and if you don’t, you should think about getting one (priest, brother, sister, deacon, or qualified lay person). SD’s are invaluable!