Crumpled, droopy brow hasn't improved 16 months after Botox. What can I do?

You need an in person examination to determine what you need to do next. See several very experienced surgeons and discuss options.

A formal exam of your facial muscles with different facial expressions is necessary to say with certainty what is going on in your case... But, it appears that the botox treatment led to hypertrophy (or strengthening and growth) of the corrugator muscle (scowl muscle) on your Right side. This could be from the pattern of muscle paralysis in the adjacent muscles causing this muscle to "overdo" it and strengthen. 
Again, you would need to be seen in consultation to verify this, but if this is the case, some Botox injected into this strong, hypertrophied muscle, may very well solve your issue. 
Please schedule your consultation with a fully-trained plastic surgeon who will have a good understanding of the underlying muscular anatomy. 

Botox should only last about 3 months.  I agree with the other surgeons that an in-person exam is in order.  I would like to see the mobility of your forehead/brow region along with the skin texture/character.  Though you may have some apprehension about Botox, some well-injected Botox may be in order and might definitely be cheaper than other alternatives.

A full set of facial photographs d relative to your eyebrows are going to be required.  If you have low  set brows present relative to her facial features,  a browlift may be required. An in-person examination according to require a determination about how to best proceed.

Thank you for the question and photos but an examination is really needed.   So go on some complimentary consultations with experts and compare recommendations after a full examination and discussion of desired results Dr Corbin

An in office examination is needed to determine the best course of action. Some well placed botox injections may fix your current concerns. See some specialists in the field to determine your options. Best regards, Michael V. Elam, M.D.