This is a really tough decision. Have you interviewed for the internship? You haven't mentioned anything about the environment and people there. Those are important things.
We're in similar positions--working toward competitive fields with not amazing pay scales. If it were me, I'd honestly check out the internship, but I am good at being poor and horribly impractical in general. I think the prudent thing here is to stay where you're at both because of the compensation and because they seem very supportive. Grad school is going to be rough even when you're just working 20-30 hours.
My approach would be to make a list of all the pros and cons of each, everything you can think of, then tack it up on the bathroom mirror or refrigerator door or somewhere you have to look at it several times a day. Then I'd impulsively take the internship in my field, but it would probably be better if you make a more reasoned decision.
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