As a writer, my first concern is how she would get the venom injected in the first place. Since you mention the navel, I am assuming the victim would be asleep (probably nude) so there would be easy access to the injection site. If she awoke there would be postmortem bruises from her struggles.

I agree that the insect, (or better) the spider world, would be a better source. Something like mimicking repeated Recluse spider bites (with an ultra fine needle and multiple injections might do the trick. If the victim has a tattoo it would partly hide the discoloration from the injection so it would be harder to locate.

Frank
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"The luxury of not getting involved departed with the last lifeboat Skipper..."

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