In this environment of mass deportation and a legislature disincline to grant any leeway to undocumented persons, it is not advisable for your friend to leave the country, if she wishes to return to the US. A genuine marriage might resolve at least a part of her documentation problem. However, speak to an immigration law attorney for solid advice about your situation. You should re-post this question under Immigration Law.
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Not in the USA. We do not have humanitarian petitions. We have a humanitarian parole petition, but it would be an uphill battle to get it under these facts.
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Unfortunately not in the present harsh anti illegal immigration and zero tolerance policy, nor under the facts you have presented. Sorry.
Kindly be advised that the answer above is only general in nature cannot be construed as legal advice, given that not enough facts are known. It is your responsibility to retain a lawyer to analyze the facts specific to your particular situation in order to give you specific advice. Specific answers will require cognizance of all pertinent facts about your case. Any answers offered on Avvo are of a general nature only, and are not meant to create an attorney-client relationship.
Unfortunately, it does not look promising based on the lawyers who have given you good advice already, you can always consult a local attorney for a second opinion though, good luck.