She's only so little - and often when babies sleep well at night, they don't have much sleep time left during the day! Babies can only sleep so much, on average, a baby sleeping through the night is 5 hours. So if you get more than that, you are very lucky

As Vanita said, try wrapping, wearing (Hug-A-Bubs are great for this, babies feel very secure, no spine compression like other pouch carriers and very comfy, so you can get on with other things without feeling like she's there!) and she sounds very normal to me! Don't let anyone tell you it's a feeding problem and she should have formula or anything like that, as you say she is thriving, but remember babies have developmental stages too where they will sleep less, be more fussy, be more clingy etc. This is just babies! It sounds like you have a gorgeous little girl there who is feeding well and sleeping well overnight - unfortunately babies also bring less sleep for mum and it's great you have family support. Don't forget to call on it when YOU need a break to rest and have some baby free time, it makes for a much easier parenting experience You could always call on a post-natal doula if you feel bad asking family for more or at night have your partner watch her, take her for a walk etc so you can have some peace and unwind time.