I *think* her total daysleep sounds about right for her age. My DD spread hers more evenly after the 3-2 (2x 1.5 hr naps) but the total sleep is about the same, you're just getting 1 shorter and one much longer, which is fine if it suits her. My DS did this but his day sleep was less- around 2-2.5hrs total (1 X 30-40min nap and 1x 1.5-2hr nap)
Sounds like you are happy with her milk intake. As you know, health advice (in UK at least) is to wait to as close to 6mo as possible to start solids.