Maybe if i right a letter and she can present to them?
Thats a good idea, be honest, don't forget to include your passport number etc.. and explain that she will be staying with you. The down side is that they may suspect shes just looking for a way in, she will have to convince them otherwise.
Everything she needs to know is here.
If you qualify for a visa you must leave your passport at the Consular Section for visa printing. The consul will give you a DHL tracking number receipt with information about the passport delivery. Your passport will be delivered to the address you submitted on the DHL form in five business days through the DHL Express Courier Service. On delivery the applicant must pay the service fee of 23 PLN.I think she needs a DHL form, in any case its all on the poland.usembassy.gov/visas/nonimmigrant-visas/how-to-apply-for-a-visa.html so check that out thoroughly.
She will be applying for a
B-1/B-2 Temporary visitor for business or pleasure.