Baby has forgotten how to bf in any other position

[KikiShack]

DD, 15 weeks and ebf has forgotten how to do anything other than lying down on our sides, tummy to tummy feeding. I have oversupply and often resort to this position as it keeps her happy and calm when too much milk comes out.
We've had sleeping issues the last couple of weeks, so I've been doing a lot of lying down feeding to try and get her to sleep, and now I think she's forgotten how to feed on my lap etc, which is causing problems when I go out for lunch. She will only have very short (3 min) frantic 'taking the edge off' feeds on my lap, refusing any more. Then if I try and feed her lying down she will hungrily latch on for 10-20 mins.
Has anyone else had this? Any advice how to break her of the habit? I'm planning to just keep practicing, but any help or ideas appreciated.
Annoyingly she feeds properly at the bf cafe, just nowhere else!

If you have fast letdown she may be getting enough in 3 minutes-I have heard of babies who feed like this where mum produces a lot of milk fast.. Or she may be getting gas in a different position possibly.
Does she do 3 minutes then look like she is still hungry (I know it's difficult to tell sometimes) ?

Hi myers yes it's exactly that- having 3 mins then looking round and rooting, lots of eating fingers, and she'll eat a lot more lying down if we're home and I give her the chance.
I just don't want to become a breastfeeding prisoner in my house! She had got into the habit of snack feeding and eats about every hour so I'm trying to distract her and encourage one long feed (happy to give the odd cup of tea type short feed, but I'd rather she had a proper meal every 3-4 hours rather than a small meal every hour in the day. And at night she does a stretch of 3-4 hours at first, then wakes every 2.5 hours after that so I'm wondering if this snacking habit had crept into nighttime too, I really hope not!

Yes, I had one like this. I just fed lying down where possible. I also had over-supply.