Hey Drinko, Normally when you give equity, their shares do not vest for at least 4 years. This is usually the case in most of the employee contracts. Also usually if any co-founder/employee leaves before an year she gets no equity. This is the standard.
As for getting the project finished, realistically learning django now is not an option. Outsourcing is an option but I wouldn't recommend it. You don't want to outsource your development at this early stage in your company.
Your best bet to getting the project finished is to threaten to fire your current developer. If she is fired before 12 months, she does not get any equity. Don't repeat the mistake of giving more equity/money to a third-grade developer who hasn't been able to get a working prototype in 12 months.