Disguise Badly Cut Bangs

How long does it typically take for bangs to grow back to a decent length after a kid does something like this? My main concern is that we have Christmas photos scheduled in about six weeks, and I'm worried her bangs will still look terrible. Plus, we're going on vacation next week, so I really need some quick fixes to make her hair look presentable. Any advice would be hugely appreciated!
First, let's talk about the growth timeline. Human hair typically grows about half an inch per month, though children's hair sometimes grows slightly faster. Since your daughter's bangs are currently about an inch long, you can realistically expect them to grow somewhere between three-quarters of an inch to a full inch over the next six weeks.
As for whether to cut that remaining chunk on the left side, you have a couple of options. If the difference is really dramatic and uneven, you might want to have a hairdresser trim it to create a more uniform look, even if it means going slightly shorter overall. However, if you can work with the unevenness using styling techniques, you might prefer to leave it alone since every bit of length will help as it grows out.
For your upcoming vacation and the weeks leading up to your Christmas photos, camouflaging those short bangs will be your best strategy. Headbands are going to be your new best friend. Choose headbands that sit just behind the hairline to hold down and conceal the shortened bangs.

To help hold everything in place, apply a small amount of styling product like mousse or light-hold gel to damp hair, then comb it back away from her face before putting on the headband or scarf. This will help train the short pieces to lay flat and stay put throughout the day.
Another great trick is to create visual interest elsewhere on her head to draw attention away from the bangs area. If her hair is long enough in the back, you could try some loose curls, a pretty braid, or even a half-up style with a decorative hair clip or bow.
For your Christmas photos specifically, consider discussing the situation with your photographer ahead of time. Many photographers are experienced with styling challenges and can suggest angles and poses that will be most flattering. They might recommend having her look slightly down.
Remember that this phase is temporary, and in a few months, you'll probably be laughing about this whole situation. In the meantime, embrace the headbands and scarves. They might just become a fun new part of her style that you'll want to continue even after her bangs grow back!
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See also:
How to trim bangs
Tips for better bangs