Car leasing opportunities? Credit rating

Good evening, it is about a friend who has a question for leasing, maybe someone knows each other. She is 22J and works for the same company for 6 years, unlimited and earns 1600 gross, she gets 1100 net out. She only pays 100E rent because she still lives at home. She already has a financing purchase for 1 year, an Opel for 233€ mtl, can this disturb the additional leasing contract? It is an A3, bj 2005 and the rate amounts to 265€ mtl, it’s about her signing the contract for her boyfriend because he has an old Schufa entry, but owns a fixed employment contract 1800Brutto. She has offered the Audi dealer the first 2month rates to pay in advance and has taken her boyfriend as a citizen, although he does not possess a positive Schufa. Now she has started the inquiry at the Audi Bank and wants to know what you mean? how her chances stand? if there are problems because she has a financial purchase on her own or because of her salary? Can you talk to the bank and maybe lure you with a down payment? What do you think the contract is going through, and what is a FIRMENLEASING? Thank you very much