It is not unusual for dogs with upset tummies to show a small amount of blood and mucus in their motions.
It usually sorts itself out within a day or so with very little or, better still, no food for 12-24 hours. If Lola is not hungry do not try & tempt her to eat. For the next day or so I would offer smallish meals of a bland diet such as chicken or rice ( I use Denes Senior tinned food )
Proboitics help such as pro-koline or natural yogurt can help.
If the motions are frequent, explosive, very runny or appear to consist of liquid blood then you need an emergency vet appointment.
Cavaliers......Tommy Tuppence 2000-2012 and a half share of Faith.
Japanese Chins.... Dandy, Benny, Bridgette and Hana.