She says Allah has not been fair to her
Let's forget about her problems for now. Right now if she has actually said the above words that are taken from your quote. She has committed INFIDELITY. because she is objecting to Allah's will. So she quickly needs to repent from this statement and say Shahada again. Otherwise she's not a MUSLIM anymore.
Remember, if we are born muslims, it doesn't necessary mean that we will remain muslims forever. There are certain actions or words which can waste one's eman. So plz encourage your friend to repent and accept Islam again and avoid making such statements. Allah does not put anyone in anymore hardships which they can not bear.