Generally, when trying to get an I-601 approved, you need to show that not only would it be an extreme hardship for the two of you to be separated by a border-- it must also be a hardship for you to go to your wife's country. Financial hardship isn't as compelling evidence of extreme hardship. However, Ciudad Juarez has a reputation of being one of the better places to get a 601; as you live in Texas, you should be able to find a local attorney with experience at that consular post. Good luck!
You need to convince them that there will be extreme hardship to you the "US Citizen". You can do that in various ways. I suggest obtaining a letter from a psychologist describing the extreme hardship to you - how it has effected you and your 2 year old daughter. Also, the hardship that you would suffer if you were forced to move to Mexico in order to reunite the family, financially, emotionally, etc.