As a general consequence for lying, I would take away something she enjoys or values, such as screen time. If you are looking for a consequence for this specific event, I might have her prepare her own lunches for a while (even if this means getting up earlier in the morning or missing out on something in the evening to do it) and freezing her lunch account so she cannot buy snacks and lunches.
We had an issue with DD buying snacks several days a week and not eating her lunch. She didn't lie to us about it per se, just never said anything. Her account was draining too fast which is why I probed her about it. Her account is now annotated to specify that she can only buy snacks one specific day a week (she can buy lunches or water any time, only snacks are restricted).
Mom to a spirited, red-headed, former 28-weeker 10/2009 and a more mellow monkey 12/2013.