@Vanessa1511 Most hosts do not provide meals for guests, whether they are long or short term guests. Some provide breakfast and include it in the price of the rental, but that's about all. Your guest shouldn't be expecting you to feed her for a month, you aren't running a restaurant.
Tea and coffee are things most hosts include free of charge in the cost of the rental, but you don't need to do that for a month-long guest unless you want to and offer it in your amenities list.
If you want to offer meals to her, then you just have to decide what you would charge for that and let her know.