The sooner they make it illegal for fair Goldfish the better! A few Councils have banned it but that's it. Sigh.
Anyway, with the filter outflow, you need it be breaking the surface. The more surface movement, the more oxygen you'll get in the tank. This is extremely important right now as you have an "uncycled" tank.
Have a good read about The Nitrogen Cycle and "New Tank Syndrome" as this can be a killer for fish.
Presuming this is a Common type Goldfish - you're looking at something that should be about 8" long, excluding tail fin, in 2 years - they need at least 150 litres or ideally a pond (ponds should be very large, not the itty bitty patio ponds). They're basically pond fish.
They're also extremely messy, basically a constant poop machine. Goldfish don't actually have a stomach, just a long modified intestine, so a lot comes out! With poop comes water quality issues - in an uncycled tank you're going to want to do small partial water changes every day. I highly recommend your DH get his hands wet sorting this as he brought in the fish in the first place!
I recommend getting a liquid test kit - NOT strips - as right now you'll want to keep an eye on ammonia, nitrite and nitrate levels. Depending on your daughter's age - fishkeeping is an excellent science lesson! This is a good kit:
apifishcare.com/product/freshwater-master-test-kit
Worrying symptoms to watch out for from the fish is hanging at the surface gulping air, sitting on the bottom looking miserable, clamped fins, shredded fins with black edging, bright red sore looking gills or black/brown splotches appearing on their body - these are all signs of too much ammonia and/or nitrites in the water.