The Ace of Wands represents the beginning of a process that leads to the realization of a financial project. This card can indicate that your cousin will have the opportunity to give you useful information to start your journey towards managing your personal finance. Also, this card suggests that your cousin will help you change your financial habits with advice from her, so you can change some of your habits related to finances.

The reversed Hierophant suggests that you may have difficulty following your cousin's advice or making decisions about the use of your money. This card is also a symbol of authority and responsibility, so you probably won't be able to escape that responsibility. Also, this card can indicate that you will have to make your own financial decisions, so you cannot completely change how you manage your finances.

The Six of Pentacles represents a period of financial stability, where all expenses are under control. This card can indicate that your cousin could give you some useful advice and information on how to manage your money more efficiently. Furthermore, this card can also suggest that you need to be aware of all the options and opportunities available to you in terms of investment, credit and insurance. So, if you decide to open a checking account with the help of your cousin, you'll need to be aware of her opinions and her recommendations.

In conclusion, the tarot reading suggests that your cousin Martina has several pieces of advice to offer regarding managing your personal finance. However, you will have to make your own decisions and you cannot avoid the liability associated with the use of your money. Furthermore, you must also be aware of all the opportunities available to you in terms of investment, credit and insurance. So, the answer to the question is: Yes, your cousin Martina can help you open a checking account by providing you with useful advice on how to manage your personal finance.