In Colorado, child support generally continues until the child turns 19, but there are circumstances under which support can end earlier, including emancipation. Based on the information you've provided, your 18-year-old daughter is working, self-supporting, and living on her own, which may indicate that she is emancipated. Courts consider several factors when determining emancipation, such as:

• The child's financial independence

• Whether the child is living independently from their parents

• Whether the child’s new lifestyle is incompatible with the idea that they are still part of the parents' household (In re Marriage of Weisbart, 39 Colo. App. 115, 564 P.2d 961 (1977)).

However, Colorado courts have also ruled that emancipation is not solely based on living arrangements or employment status. In cases like Baker v. Baker, the court found that a child working part-time and living away from home was not emancipated because they were still financially dependent on their parents while attending school.

In your case, since your daughter is 18 and appears to be financially independent, it’s possible that she may be considered emancipated, which could be grounds to end child support. However, since Colorado’s child support generally ends at 19, it may not be worth the time or financial investment to pursue this now unless there are compelling reasons to do so.

For more information on emancipation "Ending Child Support Before Age 19 in Colorado."