Get her a CO drivers license.
How long does that take? She’s been there close to 3 yrs.
To get her CO driver’s license, she will need her Birth Certificate and proof of residence (a bill sent to a CO residence). When you get a CO driver’s license, you will get a temporary license and your real license is mailed about 10 days later.
Maybe another option is to buy in CA and ship to a FFL dealer in CO?