The LD-50 charts rate Helodermatidae's venom at about the same toxicity of a Cobra. This means drop for drop, not who has the most or the biggest venom/glands/delivery, etc. They are rear-fanged with the grooved fangs being located on the mandible rather than the maxillary as in snakes. Typical of any rear-fanged reptile, they generally need to chew on you a bit to envenom you, however with the vice-grip possessed by these lizards, that would not be difficult. Losing respect for this animal or underestimating it because it seems "nice" can be FATAL. Does it happen often? No, but don't ever forget that it could if you get caught slipping.
It's a beautiful lizard, and a unique locale to obtain. Take care of her, but don't forget how toxic that venom really is. You should have antivenin in your freezer in case of emergency. All she has to do is something unexpected while your grabbing her out or changing bedding/water......I've seen it happen to people that swore it would never happen to them....I got lotsa buddies in the business missing fingers or parts of fingers lol Respect the raw power of Mother Nature. The moment you stop respecting it, is when it shows you it's ugly side.