I hear 'rentrer' - «Je dois rentrer à la maison ...» The 'r' is not emphasised (swallowed a bit, we might say) but is there. Listening practice is hard and not sure there is any foolproof way other than lots of practice - if you listen again, note that her 'm' is very clearly enunciated in other words. 

Thanks Maarten, with fresh ears it's more rentrer- but as usual in french not that clear :D