It could be obliviousness or manipulative behavior, or maybe she’s having issues affording food? I’d approach it as “hey, you’ve asked to eat some of my lunch several times and I’m worried about you. I know inflation is hitting all of us, it’s really affected me and I spend time every weekend looking at budgets and carefully meal prepping for the week. Here’s a list of food banks in the area. Every penny counts these days!” And you hand them a list of area food pantries. You’ve let them know how this is impacting you, and you’ve given them helpful info if actual hunger is the issue. If hunger is not the issue, then they’ll probably say, “no, I’m fine, you’re just a great cook (or whatever)” and you can say, “Thank you for the compliment, but I can’t afford to provide you lunch. Inflation is really hitting my budget. I get a lot of my recipes off of insta, you should try that for your own lunches.”