Having two different policies will not affect the subsidy for a tax family.
What will affect the subsidy are, among other things:
1. Whether you claim your daughter as your dependent. Since you are claiming her, you will have a tax family of the three of you (plus any other dependents you might have), and you'll add the information from both 1095-As together and report that information on your Form 8962 attached to your 1040 next spring.
If you were not to claim her as a dependent, then there are two tax families - you and your spouse and any other children in the first one, and your daughter in the second one. In this scenario, your daughter may not qualify for ACA because her income might be under 100% of FPL for a family size of one. In this case the most likely situation would be for her to sign up for her college plan if she's going to be at college, or her work plan if she's working, or Medicaid if neither of those apply.
2. Her income. If you claim her as a dependent and if she is required to file a tax return, then her AGI will be added to your household income and be reported on Line 2b of Form 8962. (If she is not required to file a return but files a return to, for example, get any withholding refunded to her, then you do not have to report her AGI on your 8962.)
If you do end up claiming her as a dependent, then how the subsidy is divided won't matter, because the math works out the same way if you're adding both policies together on your 8962.
If you're really enthusiastic about tax planning, you might consider evaluating if it's better to try to have her as a tax dependent or a tax independent this year. There are pros and cons both ways, but if you figure out that one way is better than the other, then you can work to make the facts and circumstances be such that you arrive at the answer you would prefer, rather than waiting until the end of the year and discovering that the facts and circumstances have locked you into the less preferred option.