When you save money it's kind of like a mythological mathematical creature that you let out of a tiny treasure chest, but then you have to go on a 30 year quest to capture him.

Metal bars on the Windows.

LOL.The locks - maybe a compromise is in order, where you can put in a good latch for the inside - like one of those hotel type metal hooks that are more solid than a chain, so she can crack open the door to talk to someone and still be safe? 

shop around for cheaper ironworks guys and get a quote. i would image they quote around $800 - $1000 for gating the 1 area between the walls. that should be in your budget and is better than framing in a cheapo lattice DIY gate.if i really wanted to splurge, i'd go with aluminum gate; around here socal many folks including me of amerasian diaspora seem to love the rich modern light silvery look and it imparts heaps of feng shui apparently; doesnt have the black metal bars jail look at all!

Some you could promise a battalion ship full of sunken treasure and you would get...CRICKETS.

So this is not just drilling some new 2" Tapcon screws into the concrete blocks, last one I had done they had to remove everything to the concrete blocks themselves, then epoxy in metal fins etc...all I am saying it's involved. 

They are the largest builder in the Treasure Valley where I live and they have 68 subdivisions currently under construction across 12 cities.

TJ's anecdote time.I spent several years in northern NV which is heavily dependent on metals mining.

Home needs painted but seems solid (metal) and has a good roof.  

Slightly off topic but if you replace the supply lines of your toilets do not forget to use the braided metal lines on the Clothes Washers.