Hello, I am Dr. Joey, a licensed veterinarian here to help. If she is this painful and if there is obvious swelling, then I do advocate a visit. It is possible that this is secondary to trauma, fractured toe or even a lodged foreign material (thorn or other organic debris), or a tumor. Definitely worth it to have your vet look. It might just be infected and benefit from oral antibiotics.
And let us not discount the benefit of pain relief (prescription pain relief as made for dogs) to help reduce swelling and increase her comfort level. However, it sounds like you have been doing a great job at home trying to keep her off the paw.
Be careful with bandaging, if you continue this at home, to ensure a bandage is not too tight (can cut off blood circulation and lead to terrible problems). I recommend use of a sock with some white medical tape to hold on to use at home to keep her off this, or even an Elizabethan collar (lamp-shade type collar) to use until you get her seen.
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