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I would present both your ideas and Betty's ideas to your boss and let your boss help you decide. He/she might give you some insights as to why Betty made those recommendations which would be good for you to know regardless of whether or not you implement them.
When you talk to your Boss, I'd mention that 'you and Betty talked' and that you would like to present two different plans and request his/her input. That way you can't be accused of stealing Betty's ideas but you don't specifically spell out which plan/ideas are yours and which ones are from Betty.
Then, after you finalize the plan, go back to Betty and say... "I discussed our ideas with the boss and he told me to do it this way. Thank you for your input and suggestions."
In her own clumsy way, Betty is just trying to be helpful and trying to keep you from making a mistake (in her eyes, at least). Make the most of it but don't do anything to alienate her.
You will gain priceless experience navigating through political channels which, honestly, may be more helpful in the long run than the experience you will gain from planning the event.
Just stay calm, don't panic and when in doubt, go with Betty's idea. If it doesn't work out you can always indicate tactfully that it was stronly recommended that you do it this way and that you went against your own judgement and did it that way to aviod stepping on Betty's toes. You're an intern - no one will blame you if you go Betty's way. But, if you go your way and things don't work out, you are on your own so be sure that you have the boss's blessing if you do so that you have all 4 outcomes covered (Betty's way + FAIL; Betty's way + WIN; Your way + FAIL; Your way + WIN).
Good luck and don't hesitate to ask questions here. No question is a dumb question unless you fail to ask it.
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