Jordie, I wouldn't stress too much about her not pooing if she doesn't seem uncomfortable. I don't think that tiny ammounts of custard would do that to her either. Not sure if there is a reason as to why she's not having solids just yet, but it would be good to start her on some. Even if it's just something light like apples or pears. This might help to get things moving along too.

Is she having plenty of fluids ? Plenty of breastfeeds ? She will unclog soon enough, just hope that your home when it all comes out.