Similar questions had been asked in this section earlier also. Dreams of elephant or Elephant God Ganesh is a common occurring to devout people especially those who worship or have heard about Lord Ganesha. Especially now when the Ganesh Chaturthi is approaching.
If I have to answer this question in a rational way, then what I can say is that this is a manifestation of what you would have seen or heard about elephant and Elephant god Ganesha in your general daily life recently. Our mind records and then outputs certain things not well settled inside by mixing with many other things like that.
However if a person is a deep devout having faith in such things, and one who may get disturbed unless some remedy is done,then I ca suggest an answer to you as follows.
Dreams of elephant or Ganesha ,in your case especially correlated with a lady feeding the elephant can signify that you have not fulfilled an offering you promised to a Ganesh Mandir or Ganesh. If you can recollect that well and good, then fulfil that offer or vow.
If you are not able to recollect that then twpo thigs you can do now. Visist a nearby Ganesha temple and make common offerings like modak or any otheroffering and have the prasad from there. In the coming Ganesh Chaturthi days, visit the Ganesh mandals and participate in aarathi etc and obtain prasad.
In case you have the infra structure and facilities and convenience , have a 'Ganpathi' in your house for day or more and perform Ganesh puja.
Do whatever is easily and earlier possible. You will be satisfied and happy.