Real Estate Law USA.com

A friend of mine has been renting this private home for many many years. The owner told her that he’s sold the house to a real estate developer (closing will be in 2 weeks). Should she plan to move now before the closing? Or should she wait for the new owners to let her know what their plans are? She has no lease agreement with the current owner but she was told that the real estate developer should compensate her for any expenses she will have to incur re move. What are her legal rights? How many days should she be given to move out? Thank you all for your help.