"You never take me out!"

First of all, it doesn't mean literally never. Unless it is the case, then DAMN, take her out you ass!
She feels neglected, so don't fixate on the "going out" part. There are other meanings to that, which can be summed up by "doing something together OUTSIDE a house".

What NOT to do:

• Pfffff
• Roll your eyes 
• Pretend you didn't hear
• Shout "I do take you out"
• Give an example of the last time you went out
• Blame it on money (a lot of things can be done for free)
• Say "I'm tired"
• Say "What do you want to do?"

What to do:

• Stay calm
• Admit it has been a while
• Take action
• Think of creative alternatives when short on cash (think fun, playful)
• Give her the attention she needs
• Remember what Drama means and stay away from it
• Have a positive approach

Remember not to take it personally